The shape of powder grains has a profound effect on the performance of the powder charge, as it concerns both pressure and velocity. There are multiple powder shapes including flake, ball, and extruded or “stick” (both solid and perforated).
So how does powder grain shape affect pressure and muzzle velocity?
In general, it can be said that powder that burns progressively achieves a desired muzzle velocity at lower maximum pressure than a powder that burns neutrally, not to mention a degressive powder. As grain size increases, the maximum pressure moves towards the muzzle, also increasing muzzle blast. Muzzle velocity and pressure can be adjusted by means of the amount of powder or loading density, i.e. the relationship between the powder mass and the volume available to it. As the loading density increases, maximum pressure grows.
All Vihtavuori reloading powders are of the cylindrical, single-perforated extruded stick type. The differences in burning rate between the powders depend on the size of the grain, the wall thickness of the cylinder, the surface coating and the composition. Cylindrical extruded powders can also have multi-perforated grains. The most common types are the 7- and 19-perforated varieties. A multi-perforated powder grain is naturally of a much larger size than one with a single perforation, and is typically used for large caliber ammunition.
Other types of powder grain shapes include sphere or ball, and flake. The ball grains are typically used in automatic firearms but also in rifles and handguns. The ball grain is less costly to produce, as it is not pressed into shape like cylindrical grains. Flake shaped grains are typically used in shotgun loadings.
Web thickness in gunpowder terminology means the minimum distance that the combustion zones can travel within the powder grain without encountering each other. In spherical powders, this distance is the diameter of the “ball”; in flake powder it is the thickness of the flake; and in multi-perforated extruded powders it is the minimum distance (i.e. wall thickness) between the perforations.
The burning rate of powder composed of grains without any perforations or surface treatment is related to the surface area of the grain available for burning at any given pressure level. The change in the surface area that is burning during combustion is described by a so-called form function. If the surface area increases, the form function does likewise and its behavior is termed progressive. If the form function decreases, its behavior is said to be degressive. If the flame area remains constant throughout the combustion process, we describe it as “neutral” behavior.
The cylindrical, perforated powders are progressive; the burning rate increases as the surface area increases, and the pressure builds up slower, increasing until it reaches its peak and then collapses. Flake and ball grains are degressive; the total powder surface area and pressure are at their peak at ignition, decreasing as the combustion progresses.
With shortages of factory ammunition, many more gun owners are reloading their own ammo these days. Redding offers handy, printable files for load data records and box labels.
Redding Reloading offers a handy Handloader’s Data Sheet in printable PDF format. This FREE form allows hand-loaders to document their tool settings, bushing size, powder charge, load specs (COAL etc.), and case prep status. In addition, the form allows you to enter your load testing information, complete with chronograph data, group size, zero range, and wind/temp conditions. With this single, handy form you can document all the vital information for your particular cartridges and loads. We suggest you print these out, 3-hole-punch them, and then keep them in a three-ring binder.
We’ve seen various reloading log templates, but this Redding form (shown below) is better than most because it combines both reloading data AND range-test data in one place. You can see all key details of the reloading process (tool settings etc.) plus the end results — how the load actually performed over the chronograph and on paper. This form allows the user to capture a large amount of information for later use, while accurately track load development. Go to Download Page.
FREE Ammunition Box Label Template Redding Reloading has also developed a printable template for your ammo boxes (see photo at top of article). This lets you put all vital load info on your ammo boxes. There are fields for: Date, Cartridge, Powder, Grains, Bullet, Weight, Primer, Case type. Designed for Avery 5260 (or similar) label sheets, this label template allows you to print 30 labels at one time. You can purchase the Avery 5260 peel-off printable label sheets at office supply stores.
At the request of our readers, we provide select “Deals of the Week”. Every Sunday afternoon or Monday morning we offer our Best Bargain selections. Here are some of the best deals on firearms, hardware, reloading components, optics, 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. Midsouth — Major RCBS Product Sale
⏺ 13 popular items and reloading kits on sale this week
Midsouth is running a huge sale this week on 13 of the most popular (and useful) RCBS tools, Powder Dispensers, and Reloading Kits. You can save up to $100 on popular items such as the ChargeMaster Scale/Dispenser, and the Rockchucker complete Reloading Kit. Go to Full RCBS Sale Page or click individual products below.
2. Amazon or Champion’s Choice — Plano AirGlide Case, $58.00
⏺ Get the last ones! Great range case, but no longer in production
The Plano Airglide is a unique, vertical-loading rifle case. The rifle is supported by foam blocks so there is no side-pressure on your scope turrets. The AirGlide’s hinged top-opening lid provides clearance for all but the most massive target scopes. Airglides are VERY popular with our Forum members, and this Editor uses Airglides to transport his own rifles to the range. Unfortunately, Plano has halted production of the AirGlide case. However, there are still a few available from Champion’s Choice for $58.00 (plus shipping) or from Amazon for $71.75 (free shipping). Grab one while you still can!
NOTE: Despite the name, AirGlides are NOT recommended for airline transport, but for regular range use AirGlides are a great option. Another advantage is the AirGlide holds your rifle in a muzzle-down orientation so any residual solvents drain OUT the muzzle, not back into the action.
3. Brownells — Smith & Wesson Bullpup 12ga Shotgun, $999.00
⏺ Brand new pump-action, home defense 12 gauge 14 shell capacity
Smith & Wesson just introduced a brand new home-defense shotgun. The all-new S&W M&P12 Shotgun is a compact (28″ OAL) pump shotgun with ergonomics familiar to AR owners. With two shell tubes, the gun holds 14 rounds of standard 2-3/4″ shells. You can put slugs in one tube and regular shells in the other, and switch quickly. The new M&P12 features ambidextrous controls, with an action release that can be engaged from either side, and a familiar AR-style ambidextrous safety selector. There are interchangeable palm-swell grips and M-LOK® slots for lights and lasers. Use Brownells code SRJ at check-out to save $100, lowering net cost to $999.00. This is a good deal for a new product with a $1165.00 MSRP.
4. EuroOptic — Free Extra Stock/Fore-end with Sako S20
⏺ Free factory stock and fore-end with Sako S20 Purchase
Here’s a great deal from Sako. Purchase a new Sako S20 Hunter Rifle and receive a free S20 Precision Stock and S20 Precision Forend. OR purchase a new Sako S20 Precision Rifle and receive a free S20 Hunter Stock and S20 Hunter Forend. Eligible guns include all new Sako S20 Precision and Hunter rifles purchased from July 31st through October 15th, 2021. Stocks and fore-ends are delivered by Sako 10-12 weeks after submission (deadline 11/15/2021). Click this link to REDEEM Sako Promotion.
5. Midsouth — RCBS Rotary Case Tumbler with SS Media, $169.99
⏺ Wet tumbling works great, big capacity kit includes SS Pins
Want to get your old, used brass looking like new again? Try wet-tumbling your cases with stainless media. You’ll be impressed. For wet-tumbling, a good option is the RCBS Rotary Case Tumbler. On sale now for $169.99, this comes with everything you need to get started including 5 pounds of stainless steel pin media. This is a good unit with plenty of capacity.
6. Amazon — Tipton Best Gun Vise, $84.95
⏺ Versatile, stable, works with all rifles, including ARs
When cleaning long guns, you need a secure, stable platform. We recommend the Tipton Best Gun Vise, now $84.95 on Amazon. This vise was designed to accommodate the widest possible array of firearms for cleaning, maintenance, or gunsmithing. This vise is easily configurable to handle bolt-action rifles, break-open shotguns, AR-15s, and handguns. You can also purchase the Best Gun Vise for $89.99 at Midsouth.
Need a varmint rifle scope? Here’s a killer deal on a 5-20x44mm Bushnell Nitro. This second focal plane scope boasts a handy Deploy reticle with MOA hashmarks for hold-overs/hold-offs. With this $219.49 deal you can save 56% off the regular $499.99 price. If you are looking for a lower-magnification scope, consider the 2.5-10x44mm Nitro for just $149.49 a $180 savings.
There are many other great deals on Bushnell products at Natchez, with 15 different products on sale up to 57% OFF. For example, the Bushnell 1300 Laser Rangefinder is marked down to $119.49 from $199.99, while the price of the Bushnell Tac Optics Red Dot has been slashed from $299.99 to $127.50.
8. Amazon — BOG Deathgrip Aluminum Tripod, $139.13
⏺ Versatile tripod mounts quickly, securely — use for PRS/NRL or hunting.
This is a great tripod for long-range hunters and PRS/NRL competitors. The Clamp-type head quickly secures to your rifle’s forearm for a secure shooting solution. The BOG Deathgrip Aluminum Tripod is on sale now on Amazon for $139.13. If weight is critical, there is also a lighter BOG carbon fiber tripod for $199.99. For the extra $60 you save a pound in total weight (7.5 lbs for carbon vs. 8.5 lbs for aluminum).
⏺ Sweet deal on Ear and Eye Protection — good spare set for friends
Every shooter needs good eye and ear protection. Get BOTH the E-Max Muffs and Shooting glasses for just $28.10 on Amazon with free shipping. This combo can be an affordable spare set for yourself or to have on hand for your guests. The E-Max earmuffs offer a 23 dB Noise Reduction Rating while allowing you to hear range commands.
10. Amazon — Allnice Digital Calipers, $19.99
⏺ Effective digital read-out calipers at bargain price
Every handloader needs a set of calipers for multiple reloading/measurement tasks. In fact we recommend you have at least two sets of calipers, one being an inexpensive unit that you can take to the range. These $19.99 Allnice Digital Calipers fill the bill. These calipers have a stainless steel construction and a large digital readout. User reviews have been quite positive, with 88% four- or five-star ratings.
Believe it or not, here is a cartridge that makes a .338 Lapua Magnum look like a toy. The 14.5x114mm cartridge was designed as a MG and rifle-fired anti-materiel round. To translate from the metric system to caliber and inches, the round is a mammoth .57 caliber which measures 4.49 inches to the case mouth, and 6.13 inches overall. That jumbo-sized case holds a whopping 655 grains of powder. Commonly-loaded projectiles weigh 920-1030 grains. The 993gr armor-piercing projectile has a muzzle velocity of approximately 1006 meters per second (3300 fps) and can penetrate 30-32 millimeters of RHA steel at a range of 500 meters.
The top photo comes from Elardus De Lang, a Forum member who works at the Truvelo Manufacturers Armoury in South Africa. Elardus also provided an impressive video showing the massive 14.5x114mm being shot from prone with a Truvelo-built bolt-action rifle. Elardus tells us: “Here is a video, with a slow-motion ending, of our 14.5x114mm anti-materiel rifle being fired in our indoor testing facility. This caliber is a true beast! It propels a 993gr Armor-Piercing Incendiary bullet to 3300 fps, burning 480 grains of powder in the process. [This shows] that rifles of that power level can actually be shootable. The concussion indoors is something to experience……every shot feels like you are being punched in the face, and the heat from the muzzle flash actually hits you like a wave!”
14.5x114mm Cartridge Design and Dimensions
The 14.5×114mm has 42.53 ml (655 grains H2O) cartridge case capacity. The exterior shape of the case was designed to promote reliable case feeding and extraction in bolt action rifles and machine guns alike, under extreme conditions. Cartridges typically use lacquered steel cases, but some countries also use brass cases for the 14.5x115mm.
All dimensions are in millimeters (mm). Americans would define the shoulder angle at alpha/2, or 22.5 degrees. The common rifling twist rate for this cartridge is 455 mm (1:17.91″) with eight lands/grooves. According to official guidelines, the 14.5×114mm can handle up to 360 MPa (52,213 psi) piezo pressure.
14.5x114mm Cartridge History
The 14.5×114mm (.57 Cal) is a heavy machine gun and anti-materiel rifle cartridge used by the Soviet Union, the former Warsaw Pact, modern Russia, and other countries. It was originally developed for the PTRS and PTRD anti-tank rifles, but was later used as the basis for the KPV heavy machine gun that formed the basis of the ZPU series anti-aircraft guns that is also the main armament of the BTR series of armoured personnel carriers from the BTR-60 to the BTR-80 and for heavy anti-material sniper rifles. The cartridge was designed in 1939 and first issued in 1941.
Berger Issues Safety Notice for .223 Remington 77 grain OTM Tactical Ammunition
Berger’s Load Development Team has determined that some .223 Remington 77 grain OTM Tactical (Product # 65-23030) cartridges from Lot # P002745, P002745-1, P002745-2, and P002745-3 may cause function/ignition issues with AR-style gas operating platforms. Bolt action rifles are NOT affected.
Berger Ammunition Lots # P002745, P002745-1, P002745-2, and P002745-3 .223 Remington 77 Grain OTM Tactical ammunition, Item #65-23030 was shipped to retailers on April 2nd, 2021 to April 22nd, 2021.
If you own Berger ammunition from Lot # P002745, P002745-1, P002745-2, and/or P002745-3 or have questions regarding this notice, please contact Berger Customer Support at 660-460-2802 or support@capstonepg.com to arrange replacement of the product.
EDITOR: Once again, if you are running this ammo in a bolt-action rifle, there should be no issues according to Berger. If you had intended to use the ammunition in an AR-platform rifle, contact Berger for further information.
Recall is for Berger 77gr .223 Rem Ammunition when used in AR-Platform Rifles
Story notice from ELR Researcher. We welcome reader submissions.
Need a simple, easy-to-use drop chart for your rifle? Something you can tape right to the buttstock? Then check out Hornady’s handy Online Ballistics Calculator. This user-friendly calculator will compute your drops accurately, and output a handy “Cheat Sheet” you can print and attach to your rifle.
Here’s how it works. From the Ballistics Calculator Page, simply input G1 or G7 BC values, muzzle velocity, bullet weight, zero range, and a few other variables.
Click “Calculate” to view the full chart (shown below). Then click “View Cheatsheet” and the simpler, 4-line Drop Chart (shown above) appears. Click “Print” and you’re done!
Choose Basic Table or Advanced Version with More Variables
The online ballistics caculator is easy to use. You can select the basic version, or an advanced version with more data fields for environmental variables (altitude, temperature, air pressure, and humidity). You can also get wind drift numbers by inputing wind speed and wind angle.
Conveniently, on the trajectory output, come-ups are listed in both MOA and Mils — so this will work with either MOA clicks or Mil-based clicks. There are more sophisticated ballistics solvers available on the web (such as the outstanding Applied Ballistics Online Calculator), but the Hornady Calculator is very simple and easy to use. If you just want a basic drop chart, you may want to check this out.
At the request of our readers, we provide select “Deals of the Week”. Every Sunday afternoon or Monday morning we offer our Best Bargain selections. Here are some of the best deals on firearms, hardware, reloading components, optics, 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. Cabela’s — Savage Axis XP Rifle with 3-9X Scope, $359.99
⏺ $309.99 after REBATE complete with Weaver 3-9x40mm scope
Looking for a solid, reliable hunting rifle for under $400? Head to Cabela’s for this Savage Axis XP Bolt-Action Rifle in TrueTimber Strata camo. Available in a wide range of calibers/chamberings, including .223 Rem, .243 Win, 6.5 Creedmoor, .270 Win, 7mm-08, .308 Win and .30-06, this Axis XP includes a mounted Weaver 3-9x40mm scope. NOTE: There is currently a $50.00 Savage Factory Rebate on this Axis XP rifle. That lowers your net cost to just $309.99! (Rebate 8/15/21 through 9/8/2021.)
Savage Axis XP Features:
TrueTimber Strata camo synthetic stock
Factory mounted Weaver 3-9x40mm scope
Many available chamberings
Detachable box magazine
2-position tang safety
⏺ Just add primers/powder — great value for 1000 bullets and 500 cases
If you load for 9mm Luger (aka 9x19mm), and need brass and bullets, head over to Midsouth for this 9mm Brass & Bullets Loader Pack. You get 1000 115gr FMJ bullets and 500 pieces of JAG Headstamp 9x19mm brass. This is a great way to get started or beef up your 9mm reloading components. We recommended Vihtavuori powders, and Federal or CCI primers for the 9mm Luger cartridge.
3. Bruno Shooters Supply — Kelbly Actions In-Stock
⏺ Superb actions for match rifles available now (no wait)
The thought of building a new rig can be daunting in today’s economy with massive wait times and out of stocks everywhere. One bright light in an otherwise dark world of parts availability are the Kelbly actions currently IN-STOCK at Bruno Shooters Supply. These won’t last long but if you’re planning a new custom rifle build, Kelbly actions are an outstanding option. No wait time is a big plus.
4. KYGUNCO — Anderson AM-15 Lower Receiver, $38.99
⏺ Quality 100% reliable lower at lowest price anywhere
The AR-15 has definitely become America’s rifle — good for action sports, home defense, and varmint hunting. If you’re planning to build a new AR-platform Modern Sporting Rifle, start with a good lower. And right now you can get a quality Anderson Mfg. ANDERSON AM-15 Lower Receiver for just $38.99 — the lowest price we’ve seen in LONG time. This lower has milspec dimensions and will accept standard lower parts kits, trigger sets, and grips. Getting a good, name-brand lower for under $40 is tough to beat.
5. PMA Tool — Ball Bearing Priming Tool, $135.95
⏺ Outstanding Tool — Great Reviews from our Forum members
This is one of the best priming tools you can buy — at any price. Forum members have given high praise to the PMA Ball Bearing Drive Priming Tool. This advanced tool offers super-smooth operation with excellent “feel”. The innovative ball bearing drive system complements high quality stainless construction. It is offered with no shell holder for $125.95, or with shell holder of your choice for $135.95. Grab one to start priming like a pro.
.223 Rem (5.56×45) ammo has been hard to find at decent prices. Now you can get 300 rounds of good Winchester 5.56 ammo, plus ten (10) excellent PMAG 30rd magazines, all for just $359.99. This is a good package for someone getting started with an AR-15. This 5.56 Winchester Ammo and PMAG Gen2 30rd Magazines combo pack is a very good deal. Heck you could pay $190.00 for the ten mags alone. You get 10 high quality PMAGs plus 300 round of Winchester M193 NAT0 5.56×45 ammo.
7. Natchez — Caldwell DFT2 Lead Sled Shooting Rest, $159.99
⏺ Great price — costs up to $220 elsewhere; good for sight-in tasks
When sighting-in or practicing with a large-caliber hunting rifle, a Lead Sled can provide a solid and stable platform. With heavy bags in place, Lead Sleds stay put even when shooting heavy loads. If you’ve been looking to add a Lead Sled to your range gear, here is a great deal. Right now Natchez has the top-of-the-line Caldwell Lead Sled DFT 2 Shooting Rest for just $159.99. NOTE: You must add to cart to see this great price (this sled sells for $200+ elsewhere). Caldwell’s DFT 2 Lead Sled features a dual frame design that disperses the maximum amount of recoil energy, and can hold up to 100 pounds of lead shot for stability. (Bags sold separately.)
8. Amazon — AILEMON 6X Laser Range Finder, $69.99
⏺ Budget LRF does the job, and it can be recharged via USB
Every hunter should have a rangefinder to accurately determine range to your target. Here is a good basic 6-power Laser Rangefinder that fits the budget of any hunter and is RECHARGEABLE. The AILEMON 6X Laser Range Finder can range out to 1200 yards, with a high-precision continuous scan for fast, accurate results. Unlike most LRFs, which require replaceable batteries, the AILEMON features a rechargeable battery that can be charged with a standard USB cable. Many vehicles now have USB outlets.
⏺ Self-resetting Poppers are fun, everyone should have a couple
Nobody likes getting up to reset targets, or worse yet, having to replace targets that break or wear out easily. If you’re looking for a sturdy target that resets itself, check out the Highwild AR500 12″ Classic Popper Steel Shooting Target. Made from 3/8″-thick AR500 steel, this Popper can take hit after hit. Since it resets on its own all you need to worry about is keeping your magazines loaded.
10. Amazon — Front and Rear Shooting Bags Set, $12.92
⏺ Handy low-cost bags for varmint work or NRL22 competitions
Sometimes all you need is a simple front bag rest and squeeze bag in the rear and we found a great deal. These bags will suffice for basic varmint duties, sight-in for a hunting rifle, or barricade work in an NRL22 match. The Ace Hunter Front and Rear Bag Combo is available in 3 colors (Black, Green, and Camo). For just $12.92 you get both front and rear bags, which can be linked for transport.
These bags ship unfilled so must add your preferred fill material (depending on application) — try lighter fill such as rice for field carry, with heavier sand for bench work.
Berger Twist-Rate Stability Calculator On the Berger Bullets website you’ll find a handy Twist-Rate Stability Calculator that predicts your gyroscopic stability factor (SG) based on mulitiple variables: velocity, bullet length, bullet weight, barrel twist rate, ambient temperature, and altitude. This cool tool tells you if your chosen bullet will really stabilize in your barrel.
How to Use Berger’s Twist Rate Calculator
Using the Twist Rate Calculator is simple. Just enter the bullet DIAMETER (e.g. .264), bullet WEIGHT (in grains), and bullet overall LENGTH (in inches). On its website, Berger conveniently provides this info for all its bullet types. For other brands, we suggest you weigh three examples of your chosen bullet, and also measure the length on three samples. Then use the average weight and length of the three. To calculate bullet stability, simply enter your bullet data (along with observed Muzzle Velocity, outside Temperature, and Altitude) and click “Calculate SG”. Try different twist rate numbers (and recalculate) until you get an SG value of 1.4 (or higher).
Gyroscopic Stability (SG) and Twist Rate
Berger’s Twist Rate Calculator provides a predicted stability value called “SG” (for “Gyroscopic Stability”). This indicates the Gyroscopic Stability applied to the bullet by spin. This number is derived from the basic equation: SG = (rigidity of the spinning mass)/(overturning aerodynamic torque).
If you have an SG under 1.0, your bullet is predicted not to stabilize. If you have between 1.0 and 1.1 SG, your bullet may or may not stabilize. If you have an SG greater than 1.1, your bullet should stabilize under optimal conditions, but stabilization might not be adequate when temperature, altitude, or other variables are less-than-optimal. That’s why Berger normally recommends at least 1.5 SG to get out of the “Marginal Stability” zone.
In his book Applied Ballistics For Long-Range Shooting (3rd Ed.), Bryan Litz (Berger Ballistician) recommends at least a 1.4 SG rating when selecting a barrel twist for a particular bullet. This gives you a safety margin for shooting under various conditions, such as higher or lower altitudes or temperatures.
Story idea from EdLongrange. We welcome reader submissions.
Many of our readers have been interested in learning how modern bullets are made. While a “boutique” bullet-maker, supplied with appropriate cores and jackets, can craft bullets using relatively simple hand dies and manual presses, factory production is different. The major bullet-makers, such as Barnes, employ huge, complex machines to craft their projectiles on an assembly line.
Modern hunting bullets are made with a variety of sophisticated (and expensive) machines, such as Computer Numerical Control (CNC) lathes, giant multi-stage presses, and hydraulic extruding machines that draw lead ingots into lead wire. Barnes offers an “inside look” at the bullet production process in a series of videos filmed at its Mona, UT factory. We’ve embedded four videos from the series here. These videos can also be viewed on the Barnes Bullets YouTube Channel.
Milling Slots in TSX All-Copper Bullet
This video shows how the slots (between the drive bands) in the TSX all-copper bullet are cut. The slots reduce the bearing surface that contacts the rifling. This helps reduce friction and heat, extending the life of barrels used with all-metal, drive-band bullets:
Varminator Bullets Produced in Jumbo Transfer Press
Here is the transfer press used in the production of Varminator and MPG Bullets. The process begins with a giant spool of flat copper material. The copper is stamped into jackets and eventually the formed Varminator bullets are ejected one by one into a bucket.
CNC Lathe Turns Bullets Automatically
In the video below, a Bar-Feed CNC crafts mono-bloc bullets from metal bar stock. Barnes uses a small CNC lathe to turn .50-caliber bullets from brass bar stock. We’re not sure which bullet is being made in this video. The material looks to be sintered metal. In the close-ups you can gold-colored shavings from when the machine was previously used for CNC-turned brass bullets.
Accuracy Testing in 100-yard Tunnel
Barnes regularly tests bullet samples for accuracy. In the video below, a Barnes technician loads sample rounds and tests them for accuracy in a 100-yard tunnel. The rounds are shot through a special fixture — basically a barreled action connected to parallel rods on either side. This allows the testing fixture to slide straight back on recoil (see it move back at 1:07-08 minute mark).
Upside-Down Trigger — Application for Unlimited Benchrest Competition?
Note how the tester actuates the trigger, which points UPWARDS, just the opposite of a normal rifle. The technician lightly taps the upward-pointing trigger shoe with a metal rod. Could this upside-down trigger work in benchrest shooting — perhaps with railguns? It could make for an interesting experiment.
Story suggestion by EdLongrange. We welcome reader submissions.
Here is a clever DIY tool we learned about from Frank Shuster, a Forum member, who, sadly, passed away in 2015. Frank was a very knowledgeable shooter who was always willing to help others. Here is one of Frank’s smart inventions. He devised a way to measure the length of a rifle’s chamber using a fired cartridge case. Frank’s system works by cutting a “collar” from part of the case neck. This then slips over a bullet seated in a case loaded without powder or primer. As you chamber the dummy round, the collar will move back to indicate the full length of the chamber. (Make sure the bullet is seated well off the lands so the dummy round can chamber fully.)
The pictured gauge can be home made (for free) with components you already have on hand. Frank explained: “I used a Dremel cut-off wheel to cut the front half of the case neck off. A jewelers needle file to de-burr both rough-cut edges. The cut-off surface does not need to be perfectly square, because you are using the original straight mouth to make contact at the front of the chamber. Seat any old bullet to the approximate normal seating length. Next apply a tiny drop of oil on the ogive of the bullet, and slide the ‘collar’ over the bullet. Then chamber the dummy round and close the bolt. Extract the round slowly and carefully and take the measurement with calipers (see top photo).”
Frank’s DIY chamber length gauge works well. In a related Shooters’ Forum thread, Frank posted: “I’ve compared length dimensions doing it this way and with the chamber length shown on my chambering reamer drawings, and the Sinclair gauge, and they are all within .001″ or so.”
Commercial Chamber Length Gauges May Not Work with Custom Chambers
Frank did use Sinclair chamber-length gauges for some applications. These bullet-shaped gauges slip into a cartridge, but “it’s inconvenient to order that little gauge only… without spending $6 shipping for a $7 item.” Moreover, the Sinclair gauges may not fit a custom chamber with a tighter neck dimension because the diameter of the ring at the end is too large.
As an alternative to commercial gauges, the collar-type, homemade gauge will function properly in a custom chamber. The homemade gauge will work with smaller-than-standard chamber neck dimensions, as long as you use a piece of appropriately-turned fired brass that fits your chamber.
Redding Reloading has also developed a 
Sometimes all you need is a simple front bag rest and squeeze bag in the rear and we found a great deal. These bags will suffice for basic varmint duties, sight-in for a hunting rifle, or barricade work in an NRL22 match. The 
Many of our readers have been interested in learning how modern bullets are made. While a “boutique” bullet-maker, supplied with appropriate cores and jackets, can craft bullets using relatively simple hand dies and manual presses, factory production is different. The major bullet-makers, such as 
Commercial Chamber Length Gauges May Not Work with Custom Chambers
