338 spectre parent case11/20/2023 ![]() For one thing, the 10mm magnum uses LP or LPM primers and most 6.8 brass uses SR or SRM primers. But if you feel the need for speed and want to push things to 54K psi, forming from the 6.8 SPC case is a good idea. It's much easier to just use 10mm magnum brass if you are going subsonic because you are not running pressures that are over 45K most times. Not all 6.8 brass would need reaming/turning but you'd need to check that. I also recommend annealing after you are done forming, reaming, and trimming. If you take the time to form the brass from the 6.8 SPC case then you don't even need to do that, but forming from 6.8 cases is more problematic and you need to trim off a good amount of the case as well as neck turning if the brass is too thick. By modified I mean, the horns of the extractor are VERY slightly rounded so as not to dig into the case. The 10mm Magnum case was chosen to be the parent case since it could use a VERY slightly modified 6.8 SPC bolt. SMKs without having to seat below the full diameter portion of the bullet and still use standard 6.8 magazines without modification. The case had to be short and the shoulder set back so that you could use 250-300 gr. While it was not designed to be ONLY subsonic, that was its primary function. 338 Spectre slapping the same target with a 300 gr. bullet slapping a steel target at 100 yards and the. ![]() bullets at subsonic velocities and to use standard 9mm pistol sized suppressors. ![]() No, the way I understood things from Marty, he created it to be mainly subsonic shooting 250-300 gr. Honestly, I love new rounds, but this 8.6 has me scratching my head. Granted, it's not so good as a subsonic round but for a super sonic round, it's hard to beat the. 308 action, I cannot see anything better than the. If you want more speed and out of a heavier. Of course, the Spectre is much better as a sub sonic round with the. Its only use is to get a bit more speed so you can use it on deer out to 300 yards out of the AR platform. Maker bullet and will expand down to 900 fps if I want to slow it down. 338 Spectre using the 6.8 case, gives a little over 2200 fps with a 165 gr. 338 Specter can be formed from 6.8 SPC with a bit of work for higher pressure loadings and the 10 mm Magnum case with no work other than running it through the sizing die for lower pressure loadings, which is what the Spectre was designed around, all the while out of the much lighter AR platform. It may be a different case but if it is geared toward the sub sonic crowd, then it will not do anything better than what the. 338 Spectre without giving Marty or Tony their due. Looks like somebody has decided to make their own version of the.
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