any supersonic advantage gained from higher SAAMI pressure will be reduced a bit from a smaller case capacity, The shorter shoulder length would help a bit with seating longer bullets at mag length which will help on both the sub and super end of the spectrum. 030 to keep bolts from chambering on a 6.5 creedmoor in an 8.6 chamber meaning even less capacity. 338 Fed/.358 win cases but the creedmoor case already has less capacity and they will probably do something legally well advised like push the shoulder back. I can see some of the argument for using a creedmoor case from being able to run at slightly higher pressures than the. Maybe some companies will make some 338 bullets better suited for this cartridge? The 230 ELD-X seems like the best to me but if I'm missing something I'd love to hear it. I'd love a 12.5" large frame that is as versatile as this cartridge seems. Very curious how fast the 230's will be pushed with this cartridge. Would love to hear more thoughts / comparisons. Heavy subs for <100 yds and supersonic capability to 200-250 yds.įor comparison, I used the 6.5 Grendel shooting a 130gr Berger at 2400 fps. The 375 Raptor seems much more like the AR10 version of the 300blk. It can obviously shoot heavy subs as well. This comparison only gets better if the 8.6 can shoot the 230's faster. Both these cartridges are within 0.5 mil to 750 yds. The only downside is obviously trajectory (13.4 mils to 1k vs. JBM says the 230 ELD-X stays supersonic to just over 1,000 at 2k elevation with a MV of 2,200 fps. I should have said 338 Whisper #2 biased on the fireball case.To me, it almost seems like the 6.5G big brother if it can push the 230 ELD-X at a decent speed. 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.
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