![]() For expediency sake, the 10mm Magnum brass is really the way to go. 30 Remington case (if you can find them) or the 6.8 x 43 SPC base, but we found the wall thickness to be such that it would require neck turning. The parent case is the 10mm Magnum case from Starline and a simple pass through the full-length sizing die will do the job. Currently, we offer complete AR-15 upper assemblies in this caliber, as well as single shot and bolt action rifles and we are working on the prototype AK-74SU version.Īctually, since formed brass is not yet available, forming your own cases right now is the ONLY way to get brass. In addition, it allows both high velocity and subsonic loads in the same system and delivers more energy on target than some of the competing cartridges like the. 338 Spectre is capable of MOA accuracy out to 500 yards. 458 SOCOM offers superlative performance at short(er) ranges under 150 yards, the. 338 Spectre was to offer a cartridge with broad spectrum application but primarily designed to deliver a heavy bullet with very high ballistic coefficient subsonically at extended distances. 358 CQB cartridge, which itself came about during the design of the aforementioned. It is the result of improvements to the earlier. 338 Spectre was developed by Marty ter Weeme, founder of Teppo Jutsu LLC. I should have said 338 Whisper #2 biased on the fireball case.You will note a certain similarity to the. Yes sub sonic only and maybe even some Supersonic loads But I would need to run numbers. ![]() The muzzle pressure drops a lot faster in a larger bore dia than a smaller bore dia for the same case size. ".338 Whisper #1 is made by necking up 7mm Benchrest brass to. The cartridge looks absolutely ridiculous, with a short fat case and a loooong bullet. I'd say 1/2 of the total cartridge length is bullet. We use CCI small rifle benchrest primers. I ream the flash hole and uniform the primer pockets, but I don't have a. Loading is done with Hornady Custom New Dimension full-length dies. Same load with 13.4 grains H4227 average velocity 982.4 fps, standard deviation 8.42ĭown to 13.2 gr 4227, average velocity ROSE to 996.2 fps with SD 9.43 H4226, 13.6 grains, Sierra 300 gr BTHP: Average velocity 1035 fps, standard deviation 16.37 H4227 13.8 gr, Sierra 300 gr BTHP: average velocity 1040 fps standard deviation 12.64 In view of the recent thread about bullet behavior close to the speed of sound, we may have to make some changes to get the best accuracy. Go up to 14.8 gr H4227 and average velocity is 1125 fps with SD 12.28 and groups shrink to 1.5""Įnd SNIP. The Specter is off the 10 mm mag brass so it can work in a AR platform vs the 7mm BR (308 bolt face) so it's AR10 platform. I suspect I would probably go for the common bolt face of the whisper It's loads are about the same as a 357 mag Out of a rifle length barrel the MP is not much. Whisper #2 is formed from the 221 Fireball and is OK in a AR platform. The bolt face of the Specter is an odd size being a pistol case, and is not shared with much unlike the Whisper #1 (308) and the Whisper #2 (221/223) so bolt selection is easier for the Whisper (I would go with the. 378" Whisper #2) You could even use 223 brass and form like you would 300 whisper. Sounds like a reason to do some wildcat work. It sounds like it will be fine as the 223 has a lot higher pressure curve to deal with. I don't see any reason for this not to work. I think I will change the rating o the can to reflect a certain amount of muzzle pressure instead of calibers.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |