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October 27th, 2015

Nightforce Revives the 2.5-10x24mm NXS — With Upgrades

New Nightforce 2.5-10x24mm scope optic AR

Nightforce has announced a limited re-release of its NXS 2.5-10x24mm scope, with enhancements. The 2.5-10 NXS has been discontinued since 2008, but has been requested by customers for several years due to its small size and successful use with the Mk12 5.56 Special Purpose Rifle (SPR) program. This slim, compact (9.9″ OAL) design has been popular for AR-platform rifles and hunting/safari rifles.

This limited run of NXS 2.5-10x25mm scopes will be offered with MOAR™ or Mil-R™ reticles at a $1,950.00 MSRP (street price should be lower). These scopes should be available by the first week of November from four retailers: EuroOptic, Sport Optics, Mile High Shooting Accessories, MidwayUSA.

Upgraded Controls for NXS 2.5-10x24mm
This limited run of NXS 2.5-10x24mm scopes will have some modern enhancements. A Nightforce PTL (Power Throw Lever), allows quick magnification changes even while wearing gloves. The elevation and windage turrets are updated, providing positive click-feel and easy-to-read numbers. Click values are 1/4 MOA (20 MOA per revolution) or .1 Mil-Radian (5 Mil-Rad per revolution). An elevation ZeroStop and capped windage adjustment are standard.

Click Image to download NXS 2.5-10x24mm Flyer in PDF Format:
New Nightforce 2.5-10x24mm scope optic AR

For more information, visit NightforceOptics.com or call (208) 476-9814.

Permalink New Product, Optics 1 Comment »
October 26th, 2015

Tech Tip: Changes in Humidity Can Alter Powder Burn Rates

Tech Tip Norma Powder gunpowder moisture temperature humidity

We’ve all heard the old adage: “Keep your powder dry.” Well, tests by Norma have demonstrated that even normal environmental differences in humidity can affect the way powders burn, at least over the long term. In the Norma Reloading Manual, Sven-Eric Johansson, head of ballistics at Nexplo/Bofors, presents a very important discussion of water vapor absorption by powder. Johansson demonstrates that the same powder will burn at different rates depending on water content.

Powders Leave the Factory with 0.5 to 1.0% Water Content
Johansson explains that, as manufactured, most powders contain 0.5 to 1% of water by weight. (The relative humidity is “equilibrated” at 40-50% during the manufacturing process to maintain this 0.5-1% moisture content). Importantly, Johansson notes that powder exposed to moist air for a long time will absorb water, causing it to burn at a slower rate. On the other hand, long-term storage in a very dry environment reduces powder moisture content, so the powder burns at a faster rate. In addition, Johansson found that single-base powders are MORE sensitive to relative humidity than are double-base powders (which contain nitroglycerine).

Tests Show Burn Rates Vary with Water Content
In his review of the Norma Manual, Fred Barker notes: “Johansson gives twelve (eye-opening) plots of the velocities and pressures obtained on firing several popular cartridges with dehydrated, normal and hydrated Norma powders (from #200 to MRP). He also gives results on loaded .30-06 and .38 Special cartridges stored for 663 to 683 days in relative humidities of 20% and 86%. So Johansson’s advice is to keep powders tightly capped in their factory containers, and to minimize their exposure to dry or humid air.”

Confirming Johansson’s findings that storage conditions can alter burn rates, Barker observes: “I have about 10 pounds of WWII 4831 powder that has been stored in dry (about 20% RH) Colorado air for more than 60 years. It now burns about like IMR 3031.”

What does this teach us? First, all powders start out with a small, but chemically important, amount of water content. Second, a powder’s water content can change over time, depending on where and how the powder is stored. Third, the water content of your powder DOES make a difference in how it burns, particularly for single-base powders. For example, over a period of time, a powder used (and then recapped) in the hot, dry Southwest will probably behave differently than the same powder used in the humid Southeast.

Reloaders are advised to keep these things in mind. If you want to maintain your powders’ “as manufactured” burn rate, it is wise to head Johannson’s recommendation to keep your powders tightly capped when you’re not actually dispensing charges and avoid exposing your powder to very dry or very humid conditions. The Norma Reloading Manual is available from Amazon.com.

Real-World Example — “Dry” H4831sc Runs Hotter

Robert Whitley agrees that the burn rate of the powder varies with the humidity it absorbs. Robert writes: “I had an 8-lb. jug of H4831SC I kept in my detached garage (it can be humid there). 43.5-44.0 gr of this was superbly accurate with the 115 Bergers out of my 6mm Super X. I got tired of bringing it in and out of the garage to my house for reloading so I brought and kept the jug in my reloading room (a dehumidified room in my house) and after a few weeks I loaded up 43.5 gr, went to a match and it shot awful. I could not figure out what was going on until I put that load back over the chronograph and figured out it was going a good bit faster than before and the load was out of the “sweet spot” (42.5 – 43.0 gr was the max I could load and keep it accurate when it was stored in less humid air). I put the jug back in the garage for a few weeks and I now am back to loading 43.5 – 44.0 gr and it shoots great again. I have seen this with other powders too.”

If you have two jugs of the same powder, one kept in a room in your house and one somewhere else where it is drier or more humid, don’t expect the two jugs of the same lot of powder to chrono the same with the same charge weights unless and until they are both stored long enough in the same place to equalize again.

Permalink Reloading, Tech Tip 7 Comments »
October 26th, 2015

Bargain Finder 6: AccurateShooter’s Deals of the Week

Accurateshooter Bargain Finder Deals of Week

At the request of our readers, we have launched a new “Deals of the Week” feature. If this proves popular, we’ll try to run this every Monday. Here are some of the best deals on hardware, reloading components, and shooting accessories. Be aware that sale prices are subject to change, and once clearance inventory is sold, it’s gone for good. You snooze you lose.

1. CDNN Sports — HK 416 .22LR Rimfire Rifle

AccurateShooter Deals of the Week .22LR rimfire discount HK 416 ar15 tactical rifle ammo sale bargain

If you are looking for an AR-type .22 LR rifle for cross-training and rimfire tactical matches, the HK 416 is a fine choice. Made by Walther under license, these HK 416 D145RS rimfire rifles are accurate and reliable. This is a fantastic deal at $369.88! The HK 416 normally sells for $550.00 to $600.00. One purchaser writes: “Great .22. I have had this gun a couple of months and have put about 500 rounds of 5 different brands of ammo through it. Not one FTE. I have shot other brands that can’t get through one 30-round mag without a failure.” CLICK HERE for Product Details.

2. Amazon.com — Howard Leight Electronic Earmuffs $39.86

AccurateShooter Deals of the Week Muffs hearing protection Howard Leight earmuffs sale bargain

Every shooter should own a pair of Electronic muffs, even if you prefer shooting with earplugs and/or standard muffs. Electronic muffs are great when you are doing spotting duties or are working near the firing line. They allow you to hear ordinary conversations while still providing vital hearing protection. Right now Amazon.com has the Howard Leight Impact Sport Electronic Muffs on sale for just $39.86. This is good deal — these NRR 22 muffs are currently Amazon’s #1 seller in the category. NOTE: For regular, sustained shooting we recommend muffs and/or earplugs with a higher NRR rating.

3. Brownells Discount Codes (Valid Oct. 26 – Nov. 1, 2015)

AccurateShooter Deals of the Week .22LR rimfire discount bucket bullets ammo sale bargain

With the following Discount Codes (K4K, K4M, K4N) you can save up to $60.00 on your orders at Brownells.com. Don’t Delay — these codes expire at midnight on November 1, 2015. The coupon codes are as follows:

K4K: $20 Off Orders $200+ | K4M: $40 Off Orders $350+ | K4N: $60 Off Orders $500+

4. CDNN Sports — Remington .22 LR Ammo, 1400-round Bucket

AccurateShooter Deals of the Week .22LR rimfire discount bucket bullets ammo sale bargain

If you need bulk .22 LR rimfire fodder for plinking and general fun shooting, here’s a good deal. The 1400-round Bucket of Bullets costs just $139.88 now at CDNN Sports. That works to less than ten cents a round, under $5.00 for fifty rounds. The “Bucket of Bullets” makes a nice gift for a youth program. NOTE: The product contains 1400 live loaded rounds of .22 LR ammunition, not just bullets.

5. Bass Pro Shops — Barnes Varmint Grenade Lead-Free Bullet

AccurateShooter Deals of the Week varmint grenade bullets ammo sale bargain

Do you hunt in an area where lead-core bullets are not allowed? Then consider Barnes Varmint Grenade bullets, on sale now at Bass Pro Shops. Varmint Grenade bullets feature frangible, copper-tin composite cores. These bullets can take the ultra-high velocities deliveed by popular varmint cartridges such as the .204 Ruger and 22-250. Here are SALE prices for 100-count boxes by caliber:

.20 Cal 26gr $19.99/100 | .22 Cal 36gr $22.99/100 | .22 Cal 50gr $25.99/100 | 6mm 62gr $25.99/100

6. Bruno Shooters Supply — Norma Powder SALE, $22.95/lb

AccurateShooter Deals of the Week .22LR rimfire discount bucket bullets ammo sale bargain

Right now, Bruno’s has the most popular Norma powders on sale for just $22.95 per pound. Norma makes very good powders with excellent lot-to-lot consistency. If you shoot the 6mmBR or .308 Win, consider Reloder 203B. It is virtually identical to Alliant Reloder 15 (since it is made by the same manufacturer in the same plant). Norma MRP and URP and good choices for larger calibers.

7. Grafs.com — 33% Off Nosler Ammunition (.308 Win and .30-06)

AccurateShooter Deals of the Week varmint grenade bullets ammo sale bargain

Grafs.com is running a big sale on Nosler ammo. With close-out pricing, you’ll save up to 33% on .308 Win and .30-06 loaded ammunition. In addition, Grafs has other cartridge types on sale, including: .223 Rem, .270 Win, and 300 RSAUM. The Nosler Custom ammo is loaded with very good, strong brass.

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October 26th, 2015

Seattle Gun and Ammo Tax Challenged by Firearms Groups

Seattle Gun ammo tax

Seattle recently passed a law imposing special taxes on the sale of guns and ammunition. Labeled a “gun violence” tax, the Seattle ordinance is designed to discourage firearms use and, presumably, drive gun and ammo vendors out of the city. City Council President Tim Burgess, author of the controversial Seattle ordinance, likened the gun/ammo levy to “sin taxes” on alcohol and tobacco: “We’ve been working on this for several years. We tax cigarettes and alcohol and even wood-burning stoves for public health purposes. Why not guns and ammunition?”

Opponents of the new law have taken the city to court. The NRA, Second Amendment Foundation (SAF), NSSF and other organizations have challenged the so-called “gun violence tax” recently passed by the Seattle City Council. A motion for summary judgment has been filed citing Washington State’s long-standing preemption statute which “fully occupies and preempts the entire field of firearms regulation within the boundaries of the state.”

Gun group lawyers argued that the city “is well aware of this restriction on its legislative power” because Seattle’s most recent attempt to regulate firearms was emphatically struck down by the Court of Appeals in the case of Chan vs. Seattle. (That lawsuit derailed an attempt by the city under former Mayors Greg Nickels and Mike McGinn to ban guns in city park facilities.)

Seattle Gun ammo tax

“Seattle is trying to be too clever by half,” said SAF Executive Vice President Alan Gottlieb. “This so-called ‘gun violence tax’ clearly seeks to limit access to firearms and ammunition by imposing what amounts to a regulatory fee on the sale of all firearms and ammunition within City limits. The city can’t do that, and we’re confident the court will tell them so. In the final analysis, this is an attempt to skate around, and thus erode, our state’s model preemption law. That cannot be allowed to stand. The City of Seattle is not an entity unto itself, but still part of Washington State, and therefore the city has to abide by the same laws we all follow.”

Public domain Seattle photo by Rattlhed.

Permalink News 4 Comments »
October 25th, 2015

F-Class Nationals Kick Off at Ben Avery in Phoenix

2015 F-Class Nationals Ben Avery Phoenix Arizona James Crofts

The 2015 United States F-Class National Championships are underway now at the Ben Avery Shooting Facility in Phoenix. There’s a “hybrid” format this year. For 2015, the Nationals combine both Mid-Range and Long-Range competitions in one week-long mega-match. The Mid Range F-Class Nationals take place 24-27 October 2015, with shooting at 300, 500, and 600 yards. The Long Range National Championships then run October 28 through 31, with all targets at 1000 yards. The competition consists of two different divisions: F-Open and F-TR (Target Rifle).

The wind arrived early on Saturday…
2015 F-Class Nationals Ben Avery Phoenix Arizona James Crofts

It started off somewhat windy on Saturday, October 24 for the 300-yard and 500-yard matches. Bryan Litz mastered the conditions to end up leading the F-TR division. (Guess that knowing a thing or two about ballistics helps when the wind is blowing). James Crofts, 2014 F-TR National Champion, shoot well at 500 yards, but struggled at 300 yards (the X-Ring is just 1.5″ at 300 yards). He observed: “Not a bad day today — overall 13th. Bryan Litz has the overall F-TR lead. I’m down 20 for the day but there are lots of shots left to go.”

2015 F-Class Nationals Ben Avery Phoenix Arizona James Crofts

All the shooting today (Sunday, October 25th), will be at 600 yards. Jim posted from Phoenix: “It’s time to start Day Two of the F-Class Mid-Range Nationals. All 600 yards today and I’m ready. Looks like it could be a tricky day with gusty winds but it will be the same for everyone.”

James Crofts at the 500-yard line. He had a tougher time at 300 yards.
2015 F-Class Nationals Ben Avery Phoenix Arizona James Crofts

Permalink Competition, News No Comments »
October 25th, 2015

Kirsten Carves a Pumpkin — One Shot at a Time

Halloween Pumpkin Kirsten Joy Weiss carving Volquartsen

Halloween is less than a week away. Our friend, trick-shot ace Kirsten Joy Weiss, did something special for this week, “carving” a pumpkin using her semi-auto Volquartsen .22 LR rifle. Kirsten had to send a lot of rimfire rounds into her orange friend. It turns out the little .22-caliber bullets worked better on exit than entry — Mr. Pumpkin’s posterior side was more impressive than his front. But overall, the effort turned out very well indeed, as you can see. Nice job, Kirsten.

On inspection, Kirsten found that the most impressive Jack ‘O Lantern face appeared on the reverse side of her pumpkin. The “exit wounds” were better than the entry holes.
Halloween Pumpkin Kirsten Joy Weiss carving Volquartsen

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October 24th, 2015

No More NFA for Suppressors? Hearing Protection Act Would Change Everything…

suppressor silencer sound moderator NFA 1934 ATF hearing protection

New legislation by Congressman Matt Salmon* (R-AZ) would make it much easier to purchase a suppressor (aka “silencer” or “sound moderator”) for use with firearms. The new Hearing Protection Act (HPA), H.R. 3799, will remove suppressors from the purview of the National Firearms Act (NFA), replacing the current burdensome federal transfer process with a standard NICS background check. Under the proposed law, acquiring a suppressor would be like purchasing a firearm — you would obtain the suppressor from an FFL dealer after passing a background check. There would still be a background check, but suppressor purchasers would no longer be required to fill out extensive paperwork, be fingerprinted, and pay for a $200.00 tax stamp. The HPA also includes a provision to refund the $200 transfer tax to applicants who purchase a suppressor after October 22, 2015.

Many older hunters and sport shooters suffer from hearing loss. Greater access to suppressors would help prevent that health problem. “Suppressors significantly reduce the chance of hearing loss for anyone who enjoys the shooting sports,” said Chris Cox, executive director of NRA’s Institute for Legislative Action. On average, suppressors reduce the noise of a gunshot by 20 – 35 decibels (dB), roughly the same sound reduction as earplugs or earmuffs. In addition to hearing protection, suppressors also mitigate noise complaints from those who live near shooting ranges and hunting lands.

Because suppressors safeguard hearing and reduce “noise pollution”, suppressors are widely used in many countries, including the United Kingdom. In most parts of Europe, suppressors are readily available at reasonable cost. According to the NRA-ILA, “Many European nations place no regulations on [suppressor] acquisition or use.” In the “enlightened” European view, sound moderators are considered a “good thing”. Is it time for the USA to change its laws?

It’s Time to Remove Unnecessary Burdens to Suppressor Ownership
Suppressors have been federally regulated since the passage of the National Firearms Act of 1934. The NFA regulates the transfer and possession of certain types of firearms and devices, including suppressors. Currently, prospective buyers must send in a Form 4 application to the ATF, pay a $200 transfer tax per suppressor, undergo the same background check that is required to purchase a machine gun, get a “CLEO Signoff”, and wait months for the ATF to process and approve the paperwork.

The American Suppressor Association (ASA) states that: “[The] Hearing Protection Act will fix the flawed federal treatment of suppressors, making it easier for hunters and sportsmen to protect their hearing in the 41 states where private suppressor ownership is currently legal, and the 37 states where hunting with a suppressor is legal. This legislation will remove suppressors from the onerous requirements of the NFA, and instead require purchasers to pass an instant NICS check, the same background check that is used during the sale of long guns.”

suppressor moderator silencer hearing protection act HPA

There has been a huge growth in the number of registered suppressors in the USA. From 2014 to 2015, the number of NFA-registered suppressors rose from 571,150 to 792,282. That’s a 39% increase in just one year! It’s remarkable that there are nearly 800,000 suppressors now registered in the USA. These stats are based on data published in the latest Bureau of Alcohol, Tobacco, Firearms, and Explosives (BATFE) Firearms Commerce Report.

*Joining Rep. Matt Salmon as co-sponsors of H.R. 3799, the Hearing Protection Act (HPA), are ten other U.S. Representatives: Frank Guinta (R-NH), John Carter (R-TX), Mike Kelly (R-PA), Chris Collins (R-NY), Glenn Thompson (R-PA), Tim Huelskamp (R-KS), Trent Franks (R-AZ), Mia Love (R-UT), Doug LaMalfa (R-CA), and Chris Stewart (R-UT).

Permalink News 5 Comments »
October 24th, 2015

The 6mm BRDX — a Longer-Necked Dasher

6mm Dasher BRDX whidden Darrell Jones

At the recent IBS 600-Yard Nationals, the 6mm Dasher cartridge was the most popular chambering for both Light Guns and Heavy Guns. The Dasher, a 40° improved version of the 6mmBR Norma case, can definitely shoot — no question about that. But the Dasher has one less-than-ideal feature — its very short neck. This makes it more problematic to shoot a wide variety of bullet types — short bullets as well as long. In addition, the short neck makes it harder to “chase the lands” over time.

For those folks who like the performance of the 6mm Dasher, but prefer a longer neck, there is an excellent alternative — the 6mm BRDX. This wildcat shares the 40° shoulder of the Dasher and has nearly the same capacity. Like the Dasher, the 6 BRDX can drive 100-107gr bullets to the same 3000-3050 FPS accuracy node. But the 6 BRDX has a longer neck than the Dasher. Depending on your “blow length”, the 6 BRDX will typically give you about .030″ to .035″ more usable neck length. That may not sound like much, but it is very useful if you have a longish (.110″+) freebore and you still want to shoot shorter bullets in the lands for some applications.

Your editor has a 6mm BRDX and I really like it. The neck is long enough to let me shoot 90-grainers loaded into the lands as well as 105-grainers. Fire-forming is pretty easy. I just load very long (so there is a firm jam) and shoot with 30.0 grains of Varget and a 100+ grain bullet. With a Brux barrel, my BRDX easily shoots quarter-MOA, with some 100-yard groups in the ones in calm conditions. This is with a Stiller Viper Action, and Shehane ST-1000 stock bedded by Tom Meredith.

6mm Dasher BRDX whidden Darrell Jones

6mm BRDX Reamer, Dies, and Hydro-Forming Service
It’s not difficult to set up a rifle to run the 6 BRDX. Dave Kiff’s Pacific Tool & Gauge has the reamer (just tell him the freebore you want). Whidden Gunworks offers excellent BRDX sizing and seating dies. And if you don’t like fire-forming, give Darrell Jones of DJsbrass.com a call. Darrell can hydro-form 6 BRDX brass and even turn the necks to your specs. Darrell’s hydro-forming service saves you time and preserves precious barrel life.

Permalink Bullets, Brass, Ammo, Gunsmithing 5 Comments »
October 23rd, 2015

CMP Issues Proposed Rule Changes for 2016

CMP 2015 Rule Proposed Change High Power Service Rifle

The CMP has just released proposed 2016 Competition Rules. There are a number of important proposed changes, some quite controversial. Topping the list are rule changes that would allow optics for service rifles and “modern military rifles” (MMR). If these changes are adopted, Service Rifle shooters and modern military rifle shooters will be able to use scopes up to 4.5X power. Rifle weight limits will be increased slightly to allow for the optics and the definition of “Service Rifle” will be liberalized to allow more AR variants. In addition, collapsible or adjustable-length stocks will be allowed.

CLICK HERE to Read All Proposed New Rules

We want to stress that these new rules have NOT been set in stone — not yet at least. The CMP issued its notice of Proposed 2016 Rule Changes to inform competitors and invite feedback. The CMP asks that comments/questions be sent to competitions @ thecmp.org, not later than November 13, 2015.

Major Proposed Rule Changes

1. Optical Sights For Service Rifles
The CMP states: “For several years, the CMP has recognized that optical sights are the wave of the future for Service Rifle shooting. Military recruits today do all of their training with optical sighted rifles. Service Rifle rules have traditionally tried to keep abreast of military rifle and training developments so opening Service Rifle shooting to optical sights became an inevitable change.” The 2016 rules will, for the first time, permit M16/AR15-type rifles to have optical sights (fixed power or zoom) with a maximum magnification of 4.5X and an objective lens no larger than 34 mm. There will not be a separate class for scope-sighted rifles. Instead, competitors will have a choice of using either a scope-sighted rifle that weighs no more than 11.5 pounds or a metallic-sighted rifle that will continue to have no weight limit.

2. More Options For M16/AR15-Type Rifles
Since accurized Service Rifles first came into popular use in the 1950s and 1960s, those rifles, whether M1s, M14s, or M16s and their commercial equivalents, have been rigidly defined. Legal M16-type service rifles had to retain the external profile of an M16A2 or M16A4 rifle and could only have modifications that were explicitly permitted in the rules. All this will change in 2016. The CMP plans to liberalize the Service Rifle rules to encourage greater participation. A wider variety of commercial AR-platform rifles will be allowed so long as they meet basic requirements, such as 20″ max barrel length, 5.56x45mm (.223 Rem) chambering, and a trigger pull of at least 4.5 pounds. Notably, the rifles can have either a gas-impingement system or a piston-operated gas system. Collapsible stocks will be allowed. However butt-plates and cheek-pieces may not be adjustable. (See all Requirements HERE).

3. Optical Sights for Modern Military Rifles (CMP Games)
One of the fastest growing rifle competition categories is for Modern Military Rifles. There are two classes, one for M16/AR15 platform rifles and one for a broad range of other military rifles. Competitors who compete in Modern Military Rifle Matches will now have the option of using optical sights with a maximum magnification of 4.5X. To make allowance for the increased weight of telescopes, the weight limit for AR-type rifles was increased to 8.5 pounds and for M-14/M1A rifles to 10.0 pounds. (This is a CMP Games limit — a different Rule than the Service Rifle Rule).

4. Stocks for Modern Military Rifles
Butt-stocks on these rifles may vary in length and collapsible or adjustable-length stocks will be allowed. Butt-stocks, however, may not have butt-plates or cheek-pieces that adjust up or down.

CMP 2015 Rule Proposed Change High Power Service Rifle

No Changes for Pistol, Vintage Sniper, or Rimfire Sporter Competitions
While big changes are slated for the Service Rifle and MMR disciplines, the CMP is not making significant rule changes for other popular CMP shooting sports.

Pistol Rules Are Unchanged
Except for permitting service pistols to have a Picatinny rail below the barrel, the Service Pistol and 22 Rimfire Pistol rules adopted in 2015 are unchanged.

Vintage Sniper Rifle Team Match Rules Are Unchanged
According to the CMP, Vintage Sniper Rifle Match rules “have stabilized nicely in the last two years” so there will be no 2016 rule changes for the Vintage Sniper two-man team event.

Rimfire Sporter Rifle Rules Are Unchanged
The most popular rimfire rifle match in the country continues to attract impressive numbers to its matches. Like the Vintage Sniper Rifle Team Match, these rules have now stabilized so that there are also no 2016 rule changes in Rimfire Sporter.

Top photo from www.Marines.mil.

Permalink Competition, News 15 Comments »
October 23rd, 2015

Cartridge Efficiency Basics from the USAMU

USAMU Handloading Guide Facebook cartridge efficiency

Efficient cartridges make excellent use of their available powder and case/bore capacity. They yield good ballistic performance with relatively little recoil and throat erosion.

USAMU Handloading Guide Facebook cartridge efficiency

Cartridge Efficiency: A Primer (pun intended!) by USAMU Staff

Each week, the U.S. Army Marksmanship Unit (USAMU) publishes a reloading article on its Facebook Page. In this week’s article, the USAMU discusses cartridge case efficiency and its benefits. While this is oriented primarily toward NRA High Power Rifle and Long Range (1000-yard) competition, these factors also apply to medium/big game hunters. Assuming one’s rifle and ammunition are accurate, key considerations include ballistic performance (i.e., resistance to wind effects, plus trajectory), recoil, and throat erosion/barrel life.

Efficient cartridges make excellent use of their available powder and case/bore capacity. They yield good ballistic performance with relatively little recoil and throat erosion. A classic example in the author’s experience involved a featherweight 7x57mm hunting/silhouette rifle. When loaded to modern-rifle pressures, just 43-44 grains of powder pushed a 139gr bullet at 2900 fps from its 22” barrel. Recoil in this light rifle was mild; it was very easy to shoot well, and its performance was superb.

An acquaintance chose a “do everything” 7mm Remington Magnum for use on medium game at short ranges. A larger, heavier rifle, it used ~65 grains of powder to achieve ~3200 fps with similar bullets — from its 26″ barrel. Recoil was higher, and he was sensitive to it, which hampered his shooting ability.

Similarly efficient calibers include the 6mm BR [Norma], and others. Today’s highly-efficient calibers, such as 6mm BR and a host of newer developments might use 28-30 grains of powder to launch a 105-107gr match bullet at speeds approaching the .243 Winchester. The .243 Win needs 40-45 grain charges at the same velocity.

Champion-level Long Range shooters need every ballistic edge feasible. They compete at a level where 1″ more or less drift in a wind change could make the difference between winning and losing. Shooters recognized this early on — the then-new .300 H&H Magnum quickly supplanted the .30-06 at the Wimbledon winner’s circle in the early days.

The .300 Winchester Magnum became popular, but its 190-220gr bullets had their work cut out for them once the 6.5-284 and its streamlined 140-142gr bullets arrived on the scene. The 6.5-284 gives superb accuracy and wind performance with about half the recoil of the big .30 magnums – albeit it is a known barrel-burner.

Currently, the 7mm Remington Short Action Ultra-Magnum (aka 7mm RSAUM), is giving stellar accuracy with cutting-edge, ~180 grain bullets, powder charges in the mid-50 grain range and velocities about 2800+ fps in long barrels. Beyond pure efficiency, the RSAUM’s modern, “short and fat” design helps ensure fine accuracy relative to older, longer cartridge designs of similar performance.

Recent design advances are yielding bullets with here-to-fore unheard-of ballistic efficiency; depending on the cartridge, they can make or break ones decision. Ballistic coefficients (“BC” — a numerical expression of a bullet’s ballistic efficiency) are soaring to new heights, and there are many exciting new avenues to explore.

The ideal choice [involves a careful] balancing act between bullet BCs, case capacity, velocity, barrel life, and recoil. But, as with new-car decisions, choosing can be half the fun!

Factors to Consider When Evaluating Cartridges
For competitive shooters… pristine accuracy and ballistic performance in the wind are critical. Flat trajectory benefits the hunter who may shoot at long, unknown distances (nowadays, range-finders help). However, this is of much less importance to competitors firing at known distances.

Recoil is an issue, particularly when one fires long strings during competition, and/or multiple strings in a day. Its effects are cumulative; cartridges with medium/heavy recoil can lead to shooter fatigue, disturbance of the shooting position and lower scores.

For hunters, who may only fire a few shots a year, recoil that does not induce flinching during sight-in, practice and hunting is a deciding factor. Depending on their game and ranges, etc., they may accept more recoil than the high-volume High Power or Long Range competitor.

Likewise, throat erosion/barrel life is important to competitive shooters, who fire thousands of rounds in practice and matches, vs. the medium/big game hunter. A cartridge that performs well ballistically with great accuracy, has long barrel life and low recoil is the competitive shooter’s ideal. For the hunter, other factors may weigh more heavily.

Cartridge Efficiency and Energy — Another Perspective
Lapua staffer Kevin Thomas explains that efficiency can be evaluated in terms of energy:

“Cartridge efficiency is pretty straight forward — energy in vs. energy out. Most modern single-based propellants run around 178-215 ft/lbs of energy per grain. These figures give the energy potential that you’re loading into the rifle. The resulting kinetic energy transferred to the bullet will give you the efficiency of the round. Most cases operate at around 20-25% efficiency. This is just another way to evaluate the potential of a given cartridge. There’s a big difference between this and simply looking at max velocities produced by various cartridges.”

Permalink Bullets, Brass, Ammo, Reloading 5 Comments »
October 23rd, 2015

For Hunters — Great Deals on Vortex Scopes at Midsouth

Vortex Optics sales Midsouth Shooters supply

Hunting season is here in many parts of the country. If you need a good, yet affordable scope for your hunting rig, look no further. Midsouth Shooters Supply is running a super sale right now on Vortex scopes. You can get a 4-12x44mm Crossfire II Vortex scope for just $169.99 with free shipping. Or, if you want something lighter and smaller, consider the 3-9x40mm Crossfire II. It’s a mere $149.99, again with free shipping.

If you’re concerned about the durability/longevity of these bargain-priced optics, consider this — these Crossfire scopes, like all Vortex optics products, are backed by the Vortex lifetime “VIP” warranty:

Vortex Optics sales Midsouth Shooters supply

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October 22nd, 2015

Match Report: IBS 2015 600-Yard National Championship

IBS 600 yard national championship light gun heavy gun

IBS Match Report by Tom Jacobs and Jim Bauer
“What a wonderful match” — those words were heard often during this year’s IBS 600-yard National Championship match. Tom and Sara Jacobs hosted the 600-yard Nationals September 26-27 at their Vapor Trail Valley Range in Spickard, Missouri. Attendance was strong, with 78 competitors from 14 different states. The Vapor Trail Valley range holds both 600-yard and 1000-yard yard matches throughout the year. Located in northwest Missouri, Vapor Trail Valley sits in the middle of crop ground and cattle country. The terrain is a mixture of tree lines and green pastures.

IBS 600 yard national championship light gun heavy gun

It seemed every aspect of the match came off flawlessly, thanks to the hard work of the organizers. Even the weather cooperated, with 80 degree days and 60 degree mornings. The wind was mild but twitchy, providing a challenge for the competitors. Overall though, conditions were generally good and some very impressive results were recorded. Despite the twitchy winds, over the course of the weekend, some eighty perfect 50-point targets were shot. That’s darn good shooting overall.

CLICK HERE to View Complete 600-Yard Nationals Results

600-Yard Nat’ls Light Gun Equipment List | 600-Yard Nat’ls Heavy Gun Equipment List

IBS 600 yard national championship light gun heavy gun

Interesting Factoids from Vapor Trail:
1. Competition is VERY tight now. The difference between 1st place and 20th place in Light Gun Group Aggregate was .478″, less than half an inch. The difference between 1st and 20th place in Heavy Gun Group aggregate was .480″, again less than half an inch.

2. 6mm cartridges, particularly the 6mmBR and Dasher, now dominate the 600-yard Benchrest game.

IBS 600 yard national championship light gun heavy gunAll but one Light Gun was chambered as a 6mm, mostly 6BRs or Dashers. Even in the Heavy Gun division, 6mms ruled — 58 out of 61 Heavy Guns were chambered for 6mm cartridges, mostly Dashers.

3. These rigs are capable of extreme accuracy. The ten best Light Gun groups were all under 1.250″ (FYI, at 600 yards, one-quarter-MOA is 1.570″). And, as you can see at right, the three smallest Light Gun Groups were all under 0.9″. Think about that — a one-inch group used to be considered darn good at 300 yards.

This photo shows the winners in the front row, kneeling. Left to right are: Bud Larson (HG Score), Richard Schatz (2 Gun Overall, HG Group) , and Jim Bauer (HG Overall).
IBS 600 yard national championship light gun heavy gun

After Friday practice, the match began with the Light Gun relays on Saturday. Both Light and Heavy Guns shoot 8-target Aggregates. At the end of the day Saturday, Tim Gonnerman was the Light Gun Group winner with a 2.236 Agg , edging runner-up Jason Walker by a mere .003″. That’s about as close as it gets. Dan Hullinger won Light Gun Score with a 382 (Danny Wake also had a 382 but placed second on the tie-breaker). Richard Schatz, “Mr. Consistent”, placed 4th for score and 5th for group to take the Light Gun Overall title. Last year’s two gun Champion Ryan Hunt finished in second place.

IBS 600 yard national championship light gun heavy gun

Equipment Choices of Two Gun Top 20
If you review the equipment list for the Top 20 Two Gun competitors, you’ll find that Nightforce scopes were used by 19 shooters, while BAT actions were used by 15 shooters. Remarkably, 17 out of the top 20 used rifles chambered in 6 Dasher. Hodgdon Varget was the most commonly-used powder followed by Alliant Reloder 15. In the barrel department, Brux enjoyed a slight edge over Krieger, with ten shooters using Brux Barrels vs. seven using Kriegers.

Note the large, extended-width base-plate under the forearm. This spreads the load and provides more stability when used with super-wide SEB MAX front rest.
IBS 600 yard national championship light gun heavy gun

The Heavy Guns came out on Sunday. Early morning relays saw a dead-flat wind condition that constantly changed as the day progressed. Scores settled a little and groups opened up, creating a little room between competitors. In the end, Bud Larson won the Heavy Gun Score title with a 385 total. This year’s Shooter of the Year leader Andy Ferguson was close behind with a 384. The Heavy Gun group champion is Richard Schatz with a 2.003 Agg, followed by Jim Bauer with a 2.017. The Heavy Gun overall went to Jim Bauer followed by “Andy Who?” Ferguson (see photo below).

The 2015 IBS 600-yard Two Gun Champion is Richard Schatz with 18 rank points. If you look at the new 600-yard traveling trophies, you’ll see Mr. Schatz’s name multiple times — this victory marks the third time Richard has won the 600-yard, Two Gun IBS National Championship in the past decade. Richard Schatz is certainly a great ambassador for our sport and a true gentleman. Second Place in the Two Gun overall went to Jim Bauer, not far behind with 20 rank points. Taking third was Andy Ferguson with 28 rank points.

IBS 600 yard national championship light gun heavy gun
Left to right are Two Gun Overall winner Richard Schatz, along with top female Shooter, Sally Bauer and Tom Jacobs, Vapor Trail Valley range owner.

The top lady shooter was Sally Bauer. A past IBS 1000-yard Shooter of the Year, Sally is a 7-time female National Champion in 600-yard or 1000-yard benchrest. Rory Jacobs was the Junior “Top Gun” this year, winning the Junior division and finishing 10th Overall among ALL shooters (of any age) in the Two-Gun Agg. Rory is a four-time Junior National Champion and three-time Junior shooter of the year. The top Rookie shooter was Carroll Lance.

IBS 600 yard national championship light gun heavy gun

As with many of the matches that we attend, the range owner’s family and friends make up the help for scoring and target crews, the lunch attendants and general maintenance of the ongoing match. This match is no different. Tom and Sara’s families took care of all the required chores and it all came together like a well-oiled machine. Give credit to Tom Jacobs for working with the sponsors to put together a great prize table — every shooter in attendance got a sponsored prize. Please take the time to let our sponsors know that you appreciate their generous support.

There was an excellent prize table, as this young fellow demonstrates
IBS 600 yard national championship light gun heavy gun equipment list

“Andy Who?” — Ferguson is Front-Runner in 600-Yard Shooter of the Year Race
Here’s the “Andy Who?” story. Andy Ferguson, a good friend and neighbor of the Vapor Trail Valley range owners, is currently leading the 600-yard Shooter of the Year (SOY) point competition. Given his hot shooting and top ranking in the SOY chase, some of Andy’s friends/fellow competitors thought Andy might be getting a “big head” (i.e. oversize ego). To bring him down to earth, as a joke, Andy’s friends printed up the “Andy Who?” T shirts. A good laugh was had by all.

IBS 600 yard national championship light gun heavy gun equipment list

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