300 whisper load data

Well, they didn’t. Brass is readily available, so tediously reforming .223/5.56 cases is no longer necessary.

In either loading, the .300 Blackout and Whisper do not use much powder per shot, so if you reload, powder costs are about as small as they get. His work on modifying brass was a continual headache.

I've compared some .pdf data from Nosler with similar bullet weights and it look like the Hornady 300 Whisper data at max load may be just a bit hot but I know that data from different manuals can be all over the place. by smustian » Fri Jan 16, 2015 11:26 am, Post

Each shot would travel about 10 inches into a gel block, and then the yawing bullet would veer to the top, bottom or sides of the block, and exit.

designed the cartridge, modified brass, trademarked it as the .300 Whisper, and began offering rifles and ammo. I have fired enough supersonic loads to determine that the .300 Whisper would be an excellent, albeit short range, varmint and deer cartridge. The .300 Whisper was designed to be compatible with the AR-15 platform. It was the varminting answer to “How do I use a handgun to shoot varmints?”. In developing loads for this cartridge, some published data required an excessively compressed powder charge, which bulged the case body just below the shoulder when seating bullets, effectively ruining the case. The idea was simple: take a .223 case, expand the neck to hold a .30-caliber bullet, shorten it so the neck would hold the bullet at the proper place, and fit it all into an AR-15 magazine.

J.D. There are even .300 Blackout and Whisper loads that offer expanding bullets. Powders include IMR, … Editor's Note: This article is an excerpt from Cartridges of the AR-15, available at GunDigestStore.com. It was based on the .221 Remington Fireball case necked to .30 caliber and had an overall length of 2.260 inches - same as the .223 Remington - allowing it to function in the AR-15 rifles and magazines.

The 300 AAC Blackout is the most successful 30 caliber cartridge with these design parameters and been widely accepted whereas the .300 Whisper has fallen into disuse.

But long-range target shooters wanted more. Whisper’s built after 1999 were dimensionally identical to the .300 Blackout and are fully interchangeable; however, the latter features a .015-inch longer chamber throat.

You simply cannot push a (to use as an example) 168-grain .30 bullet and a 240-grain .30 bullet at the same speed. Please try again. The end result was that the .300 Blackout and the .300 Whisper, for almost all concerned, were interchangeable. The smaller the amount they have to adjust, the less effect an error, or change in wind, will have on their scores. Well you would be wrong.

In developing loads for this cartridge, some published data required an excessively compressed powder charge, which bulged the case body just below the shoulder when seating bullets, effectively ruining the case.

You could, if you were lucky and persistent, score a supply of 175-grain FMJ-BT bullets, which were used for decades before by the military. You simply swapped uppers, loaded mil-spec magazines with the same number of .300 Whisper rounds as 5.56 NATO, and fired at will. It clocks in from just under supersonic out of a carbine-length barrel, to just over 1,000 fps from a stubby eight-inch pistol or SBR tube.

You might think I carry a gun because I don't trust God. Obviously, the Whisper's residual energy available at 150 yards is correspondingly reduced.

Testing in ballistic gelatin uncovered some very interesting results. To call him a prolific inventor is to use “prolific” lightly. If we assume a bullet design has the same ogive, and boat tail, then the only way to change weight is to make it longer. The .300 AAC Blackout has succeeded as a commercial cartridge while the Whisper never achieved wide acceptance. If you look in the article you mentioned (the same I posted before) you'll see that velocities are the same for both 300 BLK and 300 whisper factory ammo, fired in guns with chambered for either rounds. Developed by Advanced Armament Company, or AAC, the Blackout was brought into being because of AAC’s military customers. The 240, in any given cartridge, has to be going slower, simply because the pressure limit of the cartridge determines the maximum amount of energy you can use to push the bullet.

Those customers (or a certain subgroup of them) wanted a subsonic, heavy bullet, autoloading cartridge that would work with in their platform.

Well, there is not much extensive data for reloading either, but Sierra Bullets is trying to help change that.

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Firing in the .300 Whisper chamber results in a slightly sharper shoulder. A modern, expanding, .30 bullet of 110 to 125 grains, out of one of the .300s is soft in recoil, not overly noisy, and more than enough to bring down a whitetail. Top. Whisper’s built after 1999 were dimensionally identical to the .300 Blackout and are fully interchangeable; however, the latter features a .015-inch longer chamber throat. However, reloaders have found the .223 Remington or 5.56×45mm NATO works well when shortened and resized to .30 caliber. Jones-built upper for the AR-15. Currently working on loading for hand pulled 7.62X54R 147 Gr. .300 Blackout Vs .300 Whisper: Is There A Difference?

For deer hunters, this is perfect. I’m not sure you can make a barrel with a twist rate fast enough to keep them point-on in ballistic gel. If you do not have one of the expanding bullets in your .300, do not fear. Hunting bullets require adequate energy to expand and kill reliably. LPS resized to .308 .

Patrick Sweeney is the author of many of Gun Digest books' best-selling titles, including Gun Digest Book of the 1911, Vols. by TNFrank61 » Fri Jan 16, 2015 10:23 am, Post

I should mention also that Barnes, Hornady, Remington, and possibly other ammo manufacturers offer factory loads in .300 Whisper/.300 AAC Blackout, and I was able to purchase several boxes of it at my local gunshop. So, J.D.

ISS Prop House gives us the rundown on the guns used in Enemy at the Gate. In developing loads for this cartridge, some published data required an excessively compressed powder charge, which bulged the case body just below the shoulder when seating bullets, effectively ruining the case. Handgun shotshells are more complicated than one might think. For any given cartridge, operating at a certain pressure, adding weight to a bullet means you have less velocity. Hornady's 140-grain MonoFlex bullet has relief grooves formed in the shank. As you can see in the chart, I tested quite a few handloads with bullets weighing from 110 to 200 grains. It won’t hurt their shoulders, it won’t hurt their ears, and it will certainly bring down a whitetail. In order to recover bullets, I had to wrap the block on all sides with Kevlar vests. They use a 208-grain A-Max bullet for that load. The .300 Blackout is here to stay, and we take some time to look at new technology surrounding this cartridge.

...I've extrapolated the 300 Whisper data from JD Jones of SSK, found on the Quarterbore web site as well as Sierra's 300 Whisper SSP data, primarily to see what other powders they used and what bullets used.

Magnum pistol powders such as H110 work well for supersonic loads. Thank you!

.300 Whisper is also known as .300 Fireball or .300-221. The internal thickness of .223 and 5.56 brass is not a rigid specification once you get down past the case neck.

The .300 Whisper is what is known as a wildcat cartridge in that there is no set or published standard like the Sporting Arms and Manufacturers’ Institute (SAAMI) standard round would have.

I tumble the cases and brush the case necks before full-length resizing. They will, just as you had, come up with a clone of the Whisper and Blackout. |   ©2020 Outdoor Sportsman Group. So, he found that he had to ream some lots and brands of brass more than others.

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