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The .17 Mach IV / 4.4x35mm is a wildcat centerfire rifle cartridge, based on the .221 Remington Fireball case, necked down to fire a 0.172 inches (4.4 mm) bullet. The cartridge was introduced in 1962 by Vern O’Brien. [ 1 ]
The .221 Fireball has been used by wildcatters to create a small efficient .17 caliber cartridge. The most common is the .17 Mach IV which is essentially the .221 necked down to the smaller caliber. This cartridge is reported to have a very flat trajectory and to be relatively quiet with low recoil.
The .17 Remington Fireball / 4.4x36mm was created in 2007 by Remington Arms Company as a response to the popular wildcat round, the .17 Mach IV. Factory loads drive a 20 grain (1.3 g) bullet around 4,000 ft/s (1,219 m/s). Velocity is close to the .17 Remington but with
The 6.5 Grendel bullets have a true diameter of 6.71mm / 0.264" and the 6.5 Grendel case can be formed from abundant 7.62x39 cases with a neck re-sizing die, and fire-forming a slight change to the shoulder, if the case is made from brass. Many of the popular 7.62x39 cases are made from steel, which will not work for reforming the shoulder.
Name Bullet Case type Case length Rim Base Shoulder Neck Overall length .17 Hornet: 4.368 (.172) 35.6 (1.400) 8.9 (.350) 7.6 (.299) 7.3 (.288) 4.9 (.193) 43.69 (1.720) [4].17 Mach IV
.17 Ackley Bee.17 Bumble Bee.17 Mach IV.17-223.20 BR.20 Tactical.20 VarTarg.22 BR Remington.22 CHeetah.22 Eargesplitten Loudenboomer.22 PPC.22 Spitfire.25-06 Remington.30-06 Springfield wildcat cartridges.33-40 Pope.35 Whelen.38/.45 Clerke.41 Special.45 Black Powder Magnum.50 Alaskan.219 Donaldson Wasp; 5.6×39mm.257 Roberts.277 Wolverine.300 ...
Examples of hyper velocity cartridges include the .220 Swift, .17 Remington and .17 Mach IV cartridges. The US military commonly uses 5.56mm bullets, which have a relatively low mass as compared with other bullets (2,6-4,0 grams); however, the speed of these bullets is relatively fast (approximately 850 m/s (2,800 ft/s), placing them in the ...
Generally, only new, unfired .223 Remington brass is used for handloading TCU cartridges to avoid the premature case neck splits that can occur when resizing previously-fired .223 Remington brass with TCU reloading dies. Done this way, TCU sized brass generally becomes as reliable for multiple reloadings as any other handgun cartridge case.