The 300 Raptor just might be the most powerful .30-Cal magnum for a conventional-sized receiver.
With the success of the King of 2 Miles (KO2M) event and the growing popularity of extreme long range shooting, we’ve seen an increased interest in really big cartridges for really long range. One such wildcat cartridge is the 300 Raptor pioneered by Kirby Allen. This monster magnum can launch a 230gr bullet at 3350 fps. That delivers some serious ballistics at extreme long range.
Kirby Allen of Allen Precision Shooting, www.apsrifles.com, has developed a .30-caliber, jumbo-sized magnum wildcat cartridge. The powerful 300 Raptor (center in photo) is based on Allen’s 338 Excalibur parent case (far right in photo), necked down to 30 Cal with shoulder moved forward to increase case capacity. Allen states: “This is the largest capacity and performance .30 caliber magnum on the market that can be used in a conventional-sized receiver.”
Shoot 200s at 3600 fps
Performance of Allen’s new 300 Raptor is impressive. Allen claims that “200gr Accubonds can be driven to nearly 3600 fps, 230gr Berger Hybrids to 3350 fps, and the 240gr SMK to right at 3300 fps. These loads offered case life in excess of 6-7 firings per case and many of my test cases have over 8 firings on each case so they are not an overly hot load showing the potential of this big .30 caliber.”
To showcase the new cartridge, Allen built up a prototype rifle with a McMillan A5 stock, Raptor LRSS Action with extended tenon, and a Jewell trigger. The first 300 Raptor Rifle is currently on its second barrel, a new 30″, 3-groove 1:9″-twist Lilja in a custom APS “Raptor Contour”. This distinctive dual-fluted contour runs full-diameter almost to the end of the stock, and then steps down and tapers to the muzzle, where a beefy Medium 3-port ‘Painkiller’ Allen Precision brake is fitted.
Story tip by EdLongrange. We welcome reader submissions.
NSSF Applauds Congressional Passage of Great American Outdoors Act
NSSF, the trade association for the firearm industry, praised the U.S. House of Representatives’ bipartisan passage of H.R. 1957, the Great American Outdoors Act. This historic legislation is among the most meaningful legislative measures for sportsmen in recent decades. The bill now moves to President Donald Trump’s desk.
The Great American Outdoors Act will promote sustained wildlife conservation, public land hunting, and recreational shooting for current and future generations of hunters and sportsmen. The bipartisan legislation ensures full funding for the Land and Water Conservation Fund (LWCF) and addresses the maintenance backlog of public lands and water projects across the United States. Those projects include wildlife habitat conservation, road and trail repairs, and increased recreational access to public lands and waters. NSSF is confident that the legislation will be signed into law by President Trump who has previously expressed support for the bill.
View from NRA Whittington Center. NRA photo.
“This will be a great example of a promise kept by the Trump Administration for America’s sportsmen and women”, said Lawrence G. Keane, NSSF Senior Vice President of Government Relations and Public Affairs and General Counsel. “Secretary David Bernhardt and U.S. Fish and Wildlife Service Director Aurelia Skipwith recognize that our nation’s public lands belong to all Americans and the Trump Administration delivered on the guarantee that those lands and waters are accessible to America’s conservation-minded hunters and recreational target shooters. Those men and women are the greatest stewards of our natural resources and this initiative to expand and open new opportunities will nurture the next generation to enjoy and preserve our national outdoor heritage.”
Summer’s here, so many folks will head to the hinterlands on prairie dog safaris. On a good P-Dog adventure, you may shoot hundreds of rounds over a long weekend. So you’ll need plenty of ammo. With these ammo volume requirements, you probably won’t have time to load to benchrest standards, and you may not have the budget for match-grade bullets. To save time you may throw (rather than weigh) your charges, or even load on a progressive press. This all raises the question of ammo accuracy — how good is “good enough”? A Sierra Bullets expert answers that question here — explaining how to efficiently load ammo for varmint work.
Ammunition Accuracy Requirements 101 — Varmint Ammo
This story based on article by Sierra Bullets Chief Ballistician Tommy Todd
I load and shoot ammunition for a living. In my duties here at Sierra I constantly test bullet accuracy for our production needs. Because of this, I shoot a variety of different calibers and cartridges on a daily basis and a large demand of this shooting is keeping the guns and loads tuned for optimum accuracy. I have a very narrow window of tolerances to maintain in order to provide our customers (you) with the most accurate bullets on the market.
I have learned many tricks and techniques over the years to tuning a load, prepping brass, and cleaning barrels to keep a gun shooting. I often utilize the things I have learned and take them to extreme levels when competing in a shooting event. I also often ignore most of these things (other than safety) and simplify the process if the shooting I will be doing does not warrant.
Recently I went on a prairie dog shoot in Wyoming with some good friends. The targets cooperated as did the weather with the exception of some challenging winds we experienced. We had a great time and make a lot of hits on those small rodents. When loading for the .223 Remington rifles and the TC Contender, I cut a few corners in the ammunition-loading process due to both time constraints and accuracy needed. When shooting at a prairie dog a miss is simply that, but when shooting at say the X-Ring at 1000-yard competition, a poorly-placed shot [harms your] placing in the match. Because of this, I can afford to miss an occasional shot at a varmint due to ammunition capability without worry but will not allow the same tolerances in my match ammo. For the Wyoming trip I utilized a powder measure and simply dumped the charges into primed cases that had been full-length sized and primed.
I had measured enough for length to know that while there was some variance all were under maximum length. I know there is some variation of the measure I utilized but not significant enough to warrant weighing every charge. When seating the bullets a competition seating die was used and I verified OAL on the occasional cartridge to make sure nothing changed.
This varmint ammo, with thrown charges, put TEN shots inside ONE inch at 200 yards. That’s half MOA. Good Enough? Absolutely!
The ammo produced shot under one inch at 200 yards in one of the guns I planned on taking on to Wyoming with me. [Editor: That was for TEN Shots — see above.] I knew I had loaded ammunition that was quite suitable for the task at hand which was evidenced by the number of hits I was able to make at fairly long range.
NOTE: The author, Tommy Todd, explains that, when loading ammo for F-Class matches, he uses more exacting methods. He weighs every charge and seats his bullets carefully with an arbor press. Todd adapts his methodology for his particular application. The lesson here is to load to the level of precision demanded by your discipline. READ Full Story HERE.
Here is a new bipod with very useful features for hunters and tactical shooters. The new TruGlo TAC•POD™ Carbon Pro Bipod is lightweight and compact. With carbon fiber legs, it is lighter than typical metal bipods. Additionally, it employs a universal balljoint at the top. This allow the user to pan, tilt, and/or roll with one movement, and then lock the bipod in place. So, you can traverse left/right, AND adjust the barrel angle up down, AND rotate around the bore axis (to adjust for uneven ground). The new bipod is quite affordable, with MSRPs of $82.99 for 6-9″ model and $94.99 for 9-13″ model. NOTE: This bipod is so NEW that it is not yet in stock at retailers. But be patient — it should arrive later this summer.
Constructed from carbon fiber and aluminum, the TAC-POD Carbon Pro offers maximum strength with minimum weight. The mount quickly attaches to Picatinny-style rails and has a rotating design for easy shooting angle adjustment without repositioning the legs. Padded rubberized feet provide positive grip and the pivoting base offers quick leveling on uneven surfaces.
The ball-joint design allows the TAC-POD Carbon Pro to pan, tilt, and roll for various shooting positions. Users can then lock the bipod in place to maintain its position. A push-button leg lock provides smooth deployment — locking the legs in the up or down position. A twist-lock length adjustment allows each leg to independently extend. Padded rubberized feet provide positive grip retention and the pivoting base offers precision leveling on uneven surfaces.
TRUGLO TAC-POD Carbon Pro Bipod Specifications:
Model: TG8903S (6-9 inch legs, MSRP $82.99)
Model: TG8903L (9-13 inch legs, MSRP $94.99)
Pivoting base for precision leveling on uneven surfaces
Rapid, Easy Deployment/Movement with Balljoint
Carbon fiber and aluminum construction
Mounts to Picatinny rail
Padded rubberized feet
Rimfire Varmint Adventure
Can you shoot prairie dogs with a .22 LR Rifle? The answer is yes, if you have an accurate rifle, know your drops, and keep your targets within a reasonable distance (inside 240 yards). While the .17 HMR and .17 WSM are much more potent, flat-shooting, and effective P-dog slayers, a talented marksman CAN get good results with a .22 LR rimfire rifle, as ace PRS shooter and gunsmith Jim See recently proved.
Posting on his Facebook Page on 7/9/2020, Jim wrote: “Took out the .22 LR for some LR prairie poodles, there were not many in this town, but it gave me a chance to get some impressive hits. Norma TAC-22 ammo put the smack down on a first-round hit, called head shots at 189 yards. The body-shot dog was a first-round kill at 240 yards. I had one more head shot with a second round hit at 163. The nice part about using the .22 Long Rifle ammo is the [critters] don’t spook too bad, so a follow-up shot with a correction is usually available to get a better wind hold.” Even unsuppressed, a .22 LR rimfire shot makes much less noise than a centerfire round.
NOTE: The Norma TAC-22 .22 LR ammo used by Jim See offers great bang for the buck. It is quite affordable — a 50rd box is just $4.41 at Midsouth Shooters. Some lots have show outstanding accuracy. These target photos (below) come from Champion Shooters Supply which may have gotten an exceptional lot. This vendor tells us: “We have found this to run very well in Ruger rifles, handguns, and target pistols. These are 5-shot groups at 50 yards with an Anschutz 1913 rifle. This is an incredible value.” Jim says the TAC-22 delivers 1″ groups at 100 yards in his rifle.
Free Sierra Varmint Target — Prairie Enemy
Sierra Bullets has introduced a new line of loaded centerfire varmint ammunition, the Prairie Enemy series of cartridges. Sierra currently offers Prairie Enemy ammo for six cartridge types: .204 Ruger, .223 Rem, .224 Valkyrie, .22-250 Rem, .243 Win, and 6.5 Creedmoor. To celebrate this new ammo line, Sierra created a colorful Prairie Enemy P-Dog target. Click the image below to download the PDF target.
This new rifle may interest game hunters. For around $1120 (street price) the new Howa Carbon Kratos rifle combines an excellent Hogue camo stock with a carbon-wrapped barrel. This allows a rifle that is significantly lighter than a conventional hunting rifle. The carbon-wrapped barrel also features a threaded muzzle (with cap), so you can easily fit a suppressor or muzzle brake.
Howa’s new Carbon Hogue Kratos rig will first be offered in .308 Winchester, followed by 6.5 Creedmoor, 6.5 PRC, and 300 PRC chamberings. The new rifle features a 24″ Howa barrel that is carbon fiber-wrapped and threaded for suppressors or muzzle brakes. The Hogue stock is pillar-bedded and dipped in the effective Kratos camo pattern. Also available is a scoped package with a 4-16×44 Nikko Sterling Diamond FFP scope. Although the scope package adds just $220 to the MSRP, we recommend getting the bare rifle and then adding a higher quality optic. You’ll be happier in the long run.
Howa Carbon Fiber Hogue Kratos Features
Howa 1500 Action with 3-Position Safety
Howa 24″ Carbon Wrapped Barrel, threaded with cap
Excellent 2-Stage HACT Trigger
Sub-MOA at 100 yards Guarantee
Optional Scope Package with 4-16×44mm Nikko Stirling Diamond FFP
Lifetime Warranty on Rifle and Optic
COMMENTARY: We’ve shot Howa rifles and can attest that the 1500 action cycles smoothly and the HACT 2-Stage trigger is very good for a factory gun. This is definitely a viable hunting option with a high-quality stock and weight savings via the carbon-wrapped barrel. You can pay significantly more and not get a better hunting rig. Put the savings into a good Laser Range Finder.
MSRP – $1,379 for Howa Hogue Kratos Rifle Only model HGCF308KTS — .308 Win
MSRP – $1,599 for Howa Hogue Kratos Scoped Package option HGCF308KTSP — .308 Win
For more information on all Howa rifle offerings or to request a FREE 2020 catalog, visit LegacySports.com.
Adam Scepaniak, of The Guns and Gear Store, has written an interesting story about Prairie Dog Hunting in North Dakota. If a P-Dog safari is on your “bucket list”, you’ll want to read the full story in the Sierra Bullets Blog. Adam provides many tips that can help you plan a successful prairie dog adventure.
Prairie Dog Hunting in North Dakota with Sierra Bullets
It’s that time of year where lots of men and women point their vehicles westward and try to push the limits of their rifles on prairie dogs. [A few seasons back] I was a part of this group of people… while in northwestern North Dakota. CLICK HERE to Read Full Story.
Little Missouri National Grassland
Once my hunting party arrived at the Little Missouri National Grassland in North Dakota we immediately began scouting for prime prairie dog towns. There is a certain amount of strategy involved in choosing a prairie dog town … for several reasons. For one, you should try to always stay “above” the prairie dogs.
Small objects like rocks, cactuses, and prairie vegetation can easily obstruct your view if you’re shooting prone on a level plane. We encountered this in the first small prairie dog town we stopped and shot at. The prairie dog town was very visible while walking and standing, but once we laid down with our rifles on bipods the two-foot prairie grass became a severe obstruction. We shortly moved on because the small town became quick-studies to our shooting.
The second prairie dog town we hunted was at the base of a small ridge with a dried, cattle creek at the bottom. This area offered better shooting opportunities because we were above most of the prairie dog holes, and if we were not above them, a deep ravine separated us from the prairie dogs removing any obstructions from our rifle scopes which was our previous problem. This area had its own disadvantage though because of some other wildlife present. There were approximately fifty head of cattle in our close vicinity grazing, which was to no surprise because many ranchers utilize the National Grassland for grazing. We had to wait for the cattle to leave our area as to not have an incidental hit due to a rare ricochet. As the sun passed over the horizon we decided to return to this spot the next morning, but would change our shooting position to increase our advantage.
This Location Offered a Nice Overlook.
Zoomed Image Shows Individual Prairie Dog Mounds.
My previous varminting best was a 275-yard shot near Mobridge, South Dakota on a separate prairie dog hunting trip. With more experience and better reloading, Here in North Dakota I was able to make a solid hit on a prairie dog just over 400 yards which made me ecstatic! For a central Minnesota, shotgun-raised guy, I was pretty happy that my bullet selection and hand-loading ability produced a 125-yard improvement.
Once we cleaned and cased our rifles for the journey home we had shot a little over 200 rounds of my Sierra® reloads. This was a lot less than previous prairie dog trips I have been a part of, but our hit percentage was substantially higher as well. Traveling into a new area meant a lot more scouting and experimentation for us as a group. In future trips or hunts of your own, it can be very beneficial to schedule an extra day just for scouting[.]
Little Missouri National Grassland is a National Grassland located in western North Dakota. At 1,033,271 acres, it is the largest grassland in the country. Within its borders is Theodore Roosevelt National Park. The Little Missouri National Grasslands was once a part of the Custer National Forest, but is now a part of the Dakota Prairie Grasslands, a National Forest unit consisting entirely of National Grasslands. A predominant feature of the grassland is colorful and beautiful badlands, a rugged terrain extensively eroded by wind and water. It is a mixed grass prairie, meaning it has both long and short grass.
The boundaries of the grasslands on certain maps can be misleading. Within the boundaries of the national grassland are significant portions of state-owned and privately-owned land, much of it leased by cattle ranchers for grazing.
The grassland is administered by the Forest Service as part of the Dakota Prairie Grasslands from offices in Bismarck, ND. There are ranger district offices in Dickinson and Watford City.
Mr. Smith’s Tack-Driving Thumbhole Trio
What is it they say? “Can’t have too much of a good thing?” We’ll in the case of Sam Smith of Wisconsin, that goes for beautiful wood-stocked thumbhole rifles that shoot like the blazes. This week we feature a troika of thumbholes, all smithed and stocked by Richard Franklin of Richard’s Custom Rifles (Richard is now retired but still offers DVDs). Not content with a single caliber or twist, Sam commissioned three different chamberings and barrel twist rates.
First, in Fiddleback Walnut — a 6PPC Walking Varminter The most elegant of the three thumbholes is this handsome .261″-neck 6PPC. The blue-printed Rem 700 action is pillar-bedded in a highly-figured stock of laminated Curley Fiddleback Walnut, in Richard’s #004 pattern. Richard uses three sections of wood bonded together so the outside looks like a single piece of Walnut.
The lead photo at top, and the image at right show more details of this rifle. The grain really takes on a rich color in sunlight, with the Tiger-stripe figure showing brilliantly through the clearcoat. Believe it or not, Sam doesn’t even consider this one of his best-looking rifles. Sam tells us, “these three thumbhole stocks are not even close to the prettiest guns Richard has built for me–you should see the Maple ones he did for me–they are unbelievable.”
Sam tells us the gun’s 1:14″-twist Krieger barrel is a hummer — it regularly shoots one-holers at 100 yards. Sam has even logged some groups in the Zeros with the gun–awesome accuracy for a varmint rifle/Sam tells us that, using VV N133 and 58gr V-max bullets, this gun is absolutely deadly on prairie dogs out to 500 yards. (SEE: One-hole Sample Target.)
Rifle #2 — Cherry and Walnut Together in a 6mm Rem Improved
When more knock-down power or more distant targets are in order, Sam pulls out his 6mm Rem Improved 1:12″-twist thumbhole Varminter. Like the other two guns, this features a pillar-bedded Remington 700 action and Krieger barrel. While the 6mm AI’s #004 stock shares the same shape and form as the 6PPC above, it is much more colorful, employing a seven-layer laminate in Cherry and Walnut, covered with multiple coats of automotive clear-coat. One of Sam’s favorite varminters, this rifle sees more range use than his 6PPC because “the PPC is so accurate I want to keep the round count down.” That’s not to say the 6mm Improved is any slouch in the accuracy department. Using VV N160 and 75gr V-max bullets, the gun averages in the 2s and 3s. The best group to date was .189″ with the 87gr V-Max (See V-Max Target below). Chalk that up to another superbly accurate Krieger barrel combined with outstanding chambering work by Richard.
6mm Rem Improved with 87gr V-Max at 100 Yards
Rifle #3 — Fast-Twist 6.5-284 with Benchrest Forearm
Last but not least is Sam’s handsome 6.5-284 (below), also in a laminated Walnut and Cherry stock. The Krieger barrel is a Heavy Varmint contour, with an 8-twist and .290″ neck. This gun hasn’t been shot much yet, but during initial testing it grouped in the mid-threes with 53gr of H4831 and 142gr Sierra MKs. You’ll note the stock is a bit different than the other two guns–this is the #005 stock pattern, which boasts a 3″-wide, flat forearm. It is identical to the #004 from the recoil lug rearward. Sam tells us that the #005 tracks better than the #004, though he prefers the rounded forearm of the #004 for a walking varminter.
Sam’s all-time favorite stock pattern in Richard’s #007, a roll-over comb design with conventional wrist and Cooper-style Beavertail forearm. Sam has a similar Maple #007 that he says is “even nicer than the gun in the picture.”
Nice Wood? You Ain’t Seen Nothin’ Yet!
After this trio of thumbhole rifles, Sam commissioned two more rifles — a matched pair in 6mm BR Norma and 6PPC, done up in absolutely amazing 500 year-old Turkish Walnut, sourced from a one-of-a-kind 48″ diameter Burl. What does a piece of wood like this cost? Trust us, if you have to ask, you couldn’t possibly afford it. Let us just say these are some of the most spectacularly figured blanks ever shipped from Turkey and they are priced accordingly. Here’s a preview, taken right before Richard bonded the first stock together. The lower two pieces look lighter because of the flash angle but the upper section more accurately shows how all three pieces appear in natural light. “Wow” is right!
Richard Franklin is Now Retired in Montana
The last we heard, gunsmith Richard Franklin was enjoying his retirement years up in Montana. On RichardsCustomRifles.com Richard posted: “I built fine custom rifles and for many years. I was the first stock maker to laminate woods such high-grade walnut, fiddleback maple and other fancy woods. I designed my own ideas into my patterns and carved, finished, pillar bedded thousands of stocks on the rifles I built. My most popular stock pattern was my Model 11 thumbhole.
I love building rifles but my health has forced me to retire and to take time to smell the roses. I made many great videos on how to build rifles and have been selling them for many years. They are still in great demand.” CLICK HERE to check out Richard’s DVDs about rifle building and varmint hunting.
Summer Solstice 2020 was June 20th, and July’s nearly here. That means “peak heat” summer conditions. It’s vitally important to keep your ammo at “normal” temps during the hot summer months. Even if you use “temp-insensitive” powders, studies suggest that pressures can still rise dramatically when the entire cartridge gets hot, possibly because of primer heating. It’s smart to keep your loaded ammo in an insulated storage unit, possibly with a Blue Ice Cool Pak if you expect it to get quite hot. Don’t leave your ammo in the car or truck — temps can exceed 140° in a vehicle parked in the sun.
To learn more about how ambient temperature (and primer choice) affect pressures (and hence velocities) you should read the article Pressure Factors: How Temperature, Powder, and Primer Affect Pressure by Denton Bramwell. In that article, the author uses a pressure trace instrument to analyze how temperature affects ammo performance. Bramwell’s tests yielded some fascinating results.
For example, barrel temperature was a key factor: “Both barrel temperature and powder temperature are important variables, and they are not the same variable. If you fail to take barrel temperature into account while doing pressure testing, your test results will be very significantly affected. The effect of barrel temperature is around 204 PSI per F° for the Varget load. If you’re not controlling barrel temperature, you about as well might not bother controlling powder temperature, either. In the cases investigated, barrel temperature is a much stronger variable than powder temperature.”
This Editor had the personal experience of 6mmBR hand-loaded ammo that was allowed to sit in the hot sun for 45 minutes while steel targets were reset. The brass became quite warm to the touch, meaning the casings were well over 120° on the outside. When I then shot this ammo, the bullets impacted well high at 600 yards (compared to earlier in the day). Using a Magnetospeed, I then chron-tested the sun-heated ammo. The hot ammo’s velocity FPS had increased very significantly — all because I had left the ammo out in the hot sun uncovered for 3/4 of an hour.
Powder Heat Sensitivity Comparison Test
Our friend Cal Zant of the Precision Rifle Blog recently published a fascinating comparison test of four powders: Hodgdon H4350, Hodgdon Varget, IMR 4451, and IMR 4166. The first two are Hodgdon Extreme powders, while the latter two are part of IMR’s Enduron line of propellants.
The testers measured the velocity of the powders over a wide temperature range, from 25° F to 140° F. Hodgdon H4350 proved to be the most temp stable of the four powders tested.
We are coming into peak Prairie Dog season. For long shots you’ll definitely want a centerfire. We like the 20 Practical in an AR and a 22 BR/BRA in a bolt-action. That will have you covered out to 700 yards. But for shorter shots on small critters — say inside 150 yards — it makes sense to have an accurate 17 HMR rimfire rig. Today’s 17 HMRs are capable of surprising accuracy, rivaling a good centerfire rig, but with less recoil and much lower cost per shot. And the 17 HMR offers more than double the velocity of a .22 LR — up to 2650 fps with a 17-grain bullet.
Top Shot former Champion Dustin Ellerman likes his Volquartsens, and we can see why. With one of his favorite 17 HMR rimfire varmint rigs, he’s seen some outstanding accuracy with CCI ammo. A few seasons back, on his Facebook page, Dustin reported: “Prepping for prairie dogs and I’m floored by this cold, sub-half-inch group shot with the Volquartsen Custom 17 HMR at 100 yards.” This thumbhole-stock rifle features a Bowers Group USS suppressor, and 3-12x56mm Meopta Scope. Dustin tried different types of CCI 17 HMR ammo. This small group was shot with CCI A17 ammo.
What’s the effective range of a 17 HMR on prairie dogs? You might be surprised. in 2015, Dustin took another Volquartsen 17 HMR on a Prairie Dog hunt in Wyoming. He was impressed with the rifle (shown below) and the little rimfire cartridge. Dustin says the effective range of the 17 HMR is farther than one might expect: “I made hits out to 300 yards. 200 yards was easy as long as the wind wasn’t too bad.”
Here’s the Volquartsen 17 HMR Dustin used in Wyoming in 2015:
After that 2015 P-Dog expedition, Dustin became a fan of the 17 HMR cartridge: “Never paid it much attention before now because the ammo is five times more expensive than .22 LR and I mostly target shoot. However, for prairie dogs, the 17 HMR is amazing!” Consider this — Hornady’s 17 HMR ammo pushes a 17gr V-Max bullet at 2550 fps, twice as fast as typical .22 LR rounds.
Prairie Dog Adventure with Savage A17
This video shows a successful Prairie Dog hunt. Watch and you’ll see hits out to 160 yards (00:50), proving the effective range of the 17 HMR cartridge. The host is shooting a Savage A17 semi-auto 17 HMR rifle in a Boyds laminated stock.
Kirby Allen of Allen Precision Shooting, www.apsrifles.com, has developed a .30-caliber, jumbo-sized magnum wildcat cartridge. The powerful 300 Raptor (center in photo) is based on Allen’s 338 Excalibur parent case (far right in photo), necked down to 30 Cal with shoulder moved forward to increase case capacity. Allen states: “This is the largest capacity and performance .30 caliber magnum on the market that can be used in a conventional-sized receiver.”
Rimfire Varmint Adventure
Little Missouri National Grassland
The most elegant of the three thumbholes is this handsome .261″-neck 6PPC. The blue-printed Rem 700 action is pillar-bedded in a highly-figured stock of laminated Curley Fiddleback Walnut, in Richard’s #004 pattern. Richard uses three sections of wood bonded together so the outside looks like a single piece of Walnut.
To learn more about how ambient temperature (and primer choice) affect pressures (and hence velocities) you should read the article 
