If (and that’s big if) I do it again for another cartridge I’ll probably fire more rounds at each interval, shoot a slow and fast powder at each length, and use a light contour barrel since it would be easier to cut. The contents of Rifleshooter.com are produced for informational purposes only and should be performed by competent gunsmiths only. Weight (lbs) It is an excellent cartridge choice for all plains game under 680 kilograms (1,500 lb). Norma 95.5 grains of H2O (6.19 ml), .300 Winchester Magnum SAAMI cartridge dimensions. Few .30 caliber (7.62 mm) standard length cartridges can match the performance and versatility of the .300 Winchester Magnum. For our rounds, we see a slight difference in muzzle velocity with the .300 Win Mag. This greater recoil can make the .300 Winchester Magnum, despite its inherent accuracy advantages, a harder cartridge to shoot accurately, when compared to non-magnum .30 caliber cartridges such as the .30-06 Springfield or the .308 Winchester. The maximum point blank range for the 9.7 g (150 gr) bullet is 291 metres (318 yd) yards when zeroed at 250 metres (270 yd). , The .300 Winchester Magnum was introduced in 1963 by Winchester for use in the Model 70 rifle. So, it begs to question whether or not the new .300 PRC will steal the thunder of the .300 Win. Since its introduction the cartridge has remained extremely popular. Significant jumps in velocity reduction occurred between 18.25 and 16.25 inches (56, 65 ft/sec) and between 23.25 and 22.25 inches (65 ft/sec). The .300 H&H Magnum was too long for the Mauser and Springfield standard length rifle actions and required specialized rifles with a Magnum size action. The maximum point blank range for the 12 g (180 gr) bullet is 300 yards when zeroed at 232 metres (254 yd). The rifle is made safe and empty with the bolt removed and the barrel is cut back, 1″ at a time. With bullets of good sectional density and ballistic coefficients the cartridge possesses the long range performance necessary to take large game species at extended ranges. There has been some speculation that if the cartridge was released earlier, the dimensions of the cartridge would have matched the .30-338 Winchester wildcat cartridge. It has the same 2.85-inch case as the.375 H&H, requiring a magnum-length action, but it also has plenty of case capacity. Sub 1 minute-of-angle (MOA) accuracy out to 1,000 yards (910 m) is not unusual in precision-built rifles firing match-grade ammunition. “The 300 Win. Here is a list of the parts, as well as the Brownells part number: The contents of Rifleshooter.com are produced for informational purposes only and should be performed by competent gunsmiths only. The rifle became easier to handle at the expense of decreased ballistic performance and increased recoil, muzzle flip and blast. Mag., which has been roaming the fields since 1964, cranks that up to 2,950 fps and 3,478 f-p energy. For instance, when calculating maximum point blank zero for a 8″ target, the projectile will never rise more then 4″ above the line of sight or 4″ below. Discussing the methodology with friends, I originally envisioned stopping around 20″, cutting off the chamber end of the barrel and using it for a 308. 0. The 16.25 inch made my shooting buddy laugh. Mag. Mag., or become just another .300 magnum … 300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16″ 300 Win Mag? Due to the short neck, heavier bullets particularly those weighing greater than 13 grams (200 gr) and mono-metal bullets such as the Barnes X bullets will need to be seated more deeply into the cartridge. A commonly asked question on hunting, long range shooting and Mil/LE forums is, “how long should the barrel on a 300 Winchester Magnum be?” I’ve been coming up short of any objective analysis of barrel length based off of actual data- i.e., cutting back the same barrel and publishing actual velocities. slugs.  However, bullets weighing between 7.1–16.2 g (110–250 gr) are available to the reloader for the .300 Winchester Magnum. Other cartridges, while available, are more expensive. I have a Tikka 300 Win Mag and use the Noslar 180 gr Ballistic Tip and Accubond, both run at 2960 fps out of the 24 inch barrel. Almost no divergence between C.I.P. , The .300 Winchester is extremely versatile and has been adopted by a wide range of users including hunters, target shooters, military units, and law enforcement departments. , Belted, bottlenecked magnum rifle cartridge, .300 Winchester Magnum (center) flanked by its parent cartridges: the, Military and law enforcement applications, Remington Model 700 Police Long Action tactical rifle, List of crew-served weapons of the U.S. Armed Forces, ANSI/SAAMI Velocity & Pressure Data: Centerfire Rifle, "Top cartridges & bullets for black bears", DETAIL SPECIFICATION CARTRIDGE, .300 WINCHESTER MAGNUM MATCH, MK 248 MOD 1 DODIC AB43, NSN 1305-01-568-7504 Revision A March 17, 2009, "U.S. Navy Small Arms Ammunition Advancements", "$49.9M U.S. Contract for 300 Winchester Magnum Ammo", "Advances in U.S. Sniping Ammunition: From Vietnam to Afghanistan by John Plaster - Thursday, September 12, 2013", JBM Ballistics freeware online ballistic calculator, "Weapon Employment Zone (WEZ) Analysis of the XM-2010 Rifle With Various Ammunition Types by Bryan Litz, Applied Ballistics LLC", Pentagon’s Top Tester Gives Sniper Round Passing Grade, "Magnum force: Kimber's police tactical rifle now chambers the potent .300 Winchester Magnum". has a big appetite for propellant, burning 20 to 25 percent more propellant for only a 10 percent increase in velocity over the .30-’06 Sprg. UPDATE: 1/1/15, see below for 308 Winchester and 223 Remington. Winchester finally introduced the .300 Winchester Magnum in 1963. The U.S. government purchased MK 248 MOD 1 .300 Winchester Magnum match-grade ammunition in 2009 for use in adapted M24 Sniper Weapon Systems and other .300 Winchester Magnum sniper rifles like the U.S. Navy Mk.13s.  The 3.55 in (90.2 mm) long MK 248 MOD 1 or alike ammunition is not offered commercially, since it exceeds SAAMI standards for overall length and maximum chamber pressure. Recommended twist ratio is 1:10 (254 mm). The amount of recoil the cartridge generates is a step up from the non-magnum .30 caliber (7.62 mm) cartridges. The .300 Weatherby Magnum was introduced in 1944. is simply one of the most flexible cartridges for North America and African plains game,” Phil says. Although cartridges such as the .30-378 Weatherby Magnum, .300 Remington Ultra Magnum and the .300 Weatherby Magnum all exceed performance of the .300 Winchester Magnum none of these cartridges can be chambered in a standard length action. The Weatherby cartridges involved blowing out (reducing the taper) of the Magnum H&H cases, bottlenecking them to the required caliber and shortening them to fit the standard rifle actions of the era. Standard deviation generally decreased as the barrel got shorter. Initially we (it’s always good to bring a friend with this much cutting) used a cordless Sawzall to make the cuts, after the battery died, we switched to a hacksaw. regulated countries every rifle cartridge combo has to be proofed at 125% of this maximum C.I.P. In 1958 Winchester introduced three cartridges – the .264 Winchester Magnum, .338 Winchester Magnum and the .458 Winchester Magnum, all based on the shortened and blown out .375 H&H Magnum case. You can read about our far more practical 16.5″ 308 here: Project Guns- Gunsmithing articles and posts, Leupold Mark 6, 3-18 scope with TMR reticle, Federal Gold Medal 300 Winchester Magnum Ammunition 190 SMK, MagnettoSpeed V2 barrel mounted ballistic chronograph, 308 Winchester / 7.62x51mm NATO: Barrel Length versus Velocity (28″ to 16.5″), 223 Remington/5.56 NATO, velocity versus barrel length: A man, his chop box and his friend’s rifle, Short Rifle, Long Range: Testing our 16.5″ 308 Remington 700 out to 635 yards, 7.62x51mm NATO (308 Win) Barrel Length and Velocity: IMI Samson 150 grain FMJ, Building a Custom 6.5 Creedmoor Precision Rifle, TRACT TORIC 4-20X50 UHD 30mm Rifle Scope Review, Review: Sig Sauer 6.5 Creedmoor 140 gr. The short neck was thought to hinder accuracy because it would prevent the alignment of cartridge to the bore, but this is rarely an issue either today or when the cartridge was designed. I’m going to install a brake, crown the barrel the right way and be the proud owner of a 16.25 inch 300 Winchester Magnum barrel… I’m unsure I’ll shoot it much, if at all, but at least I can definitively tell someone what happens when you cut your 300 Winchester Magnum to 16.25 inches. Mag., given the powder capacity of the case and the superior sectional density (SD) of the heavier bullet. This means that .300 Winchester Magnum chambered arms in C.I.P. This was an experiment I kicked around for the past year or so. The ability to zero the .300 Winchester Magnum and shoot without hold over to 270 metres (300 yd) makes the cartridge one of the flatter shooting cartridges. The ammunition standards organizations SAAMI (Sporting Arms and Ammunition Manufacturers' Institute) and C.I.P. wins here because it has the powder capacity to handle bullets as heavy as 220 grains, moving them as fast as 2,770 fps to generate a bone-crushing 3,800 ft lbs of energy. Bullet weights of 10.7–13.0 grams (165–200 gr) are the preferred choices for these game species. Speed and Trajectory: The big difference here is that the 300 win mag will send a 180 grain bullet, which is at the top end of the 308’s abilities, at almost 3000 fps. My follow up article is here Does size matter? The rifle was zeroed at 100-yards and the testing began. Enter your email address to subscribe and receive notifications of new posts by email. The .300 Winchester Magnum is powerful enough to hunt any North American game animal. As for the 208 gr bullet I don't use that in the win Mag but my 300 Rum. If we were to take averages of all the rounds, then there would be a slight advantage to for the 7mm Rem Mag rounds at each yard marker and each time the difference is less than 100fps. To put this into perspective, a Boeing 737 commercial airliner travels at a cruising speed of 600 mph, or 880 fps. The.300 Win. Notably, the .300 Win Mag cartridge fires a projectile that on average can best the .308 Winchester cartridge by 50% on overall distance while maintaining lethality. It is particularly useful when hunting the members of the ungulate family such as elk and mooseand is a popular cartridge among hunters for these class 3 game species. Taken together with its performance it remains one of the most useful and popular cartridges today. Compared with the 30-06 Springfield the .300 Winchester Magnum provides a roughly 400 ft/s (120 m/s) increase in velocity. This was the first time the Pentagon's Director, Operational Test and Evaluation (DOT&E) tested the round, which can hit targets out to 1,200 m (1,312 yd).. Winchester developed the .300 Winchester Magnum by taking the .338 Winchester Magnum, which was introduced in 1958, and moved the shoulder forward by 4.0 millimetres (0.156 in) and lengthening it by 3.0 millimetres (0.120 in). On the other hand, recoil is subjective (some are more sensitive to it than others) and one can get used to it with practice. Great care has been given by Hornady engineers to develop superior, match-accurate hunting loads that allow the ELD-X ® bullet to achieve its maximum ballistic potential. This caused the cartridge to have a neck shorter than the diameter of the bullet. Even at these velocities, though, the cartridges maintain the legendary accuracy the .300 Win. Barrel length, Barrel length and velocity, Cartridge Selection, Precision Rifles, Rifles I selected Federal 190 grain Gold Medal ammunition for this test. Yes, it did, but less then expected. Rifleshooter.com and its authors,do not assume any responsibility, directly or indirectly for the safety of the readers attempting to follow any instructions or perform any of the tasks shown, or the use or misuse of any information contained herein, on this website. 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