Obviously, the Whisper's residual energy available at 150 yards is correspondingly reduced. One, the Whisper bullet's muzzle velocity is similar to the remaining velocities at 100 to 150 yards of other, more common hunting cartridges. I do see two reasons to emphasize the round's limited range. The 110- and 125-grain handloads would readily dispatch any coyote or chuck within 150 yards or so, and the 130-, 150-, and 168-grain ammo, properly placed, is just powerful enough to take a porker or whitetail. 300 Whisper would be an excellent, albeit short range, varmint and deer cartridge. I have fired enough supersonic loads to determine that the. 300 Whisper/.300 AAC Blackout cartridge? I still have no experience with subsonic ammo fired in a suppressed rifle, but common sense tells me whatever is on the receiving end of a 200-grain bullet traveling at about 1,000 fps is in big trouble. So, what impressions have I gained with my renewed experiments with the. It launches heavy bullets slower than the speed of sound so there is no "crack" caused by a sonic boom. It probably isn't needed, but the seater die can be adjusted to apply a crimp - so I did. I trimmed the cases for these handloads because I intended to crimp the case mouth into the rearmost groove. Hornady's 140-grain MonoFlex bullet has relief grooves formed in the shank. Unless you want to crimp the bullet in place, trimming your brass is optional. I tumble the cases and brush the case necks before full-length resizing. 300 Whisper/.300 AAC Blackout, and I was able to purchase several boxes of it at my local gunshop. I should mention also that Barnes, Hornady, Remington, and possibly other ammo manufacturers offer factory loads in. Brass is readily available, so tediously reforming. 300 Whisper/AAC Blackout is no different than most other bottleneck rifle rounds. Not knowing just what to expect, I thought 2 MOA was acceptable performance for this cartridge/rifle/optic combination. I fired the iron-sighted Contender at 25 yards and the M&P15 at 50 yards to start, but after I'd fired 100 or so rounds in the rifle, I moved out to 100 yards and fired a few select loads. I wasn't into suppressed ARs, so I limited my experiments to lighter bullets traveling at supersonic velocities. As I recall, I then just full-length sized them and added primer, powder, and bullets. The special tapered expander die that came with those dies swiftly and smoothly reformed the cases. 300 Whisper with a set of Hornady dies and some new. It wasn't a SAAMI standard round, and back then only CorBon offered factory-loaded ammo. Adding a suppressor gave you a potent law enforcement or military asset.Īt the time, ARs were not on my radar, but working with a new and interesting cartridge was right up my alley. 300 Whisper rounds as 5.56 NATO, and fired at will. You simply swapped uppers, loaded mil-spec magazines with the same number of. 300 Whisper was designed to be compatible with the AR-15 platform.
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