300 W would be the best option for dedicated rifle. But it would be nice if there was something compatible with the 308 bolt face, that had less capacity than 30BR for switch-barrel rigs like the AIAW.
Anyone ever try creating a smaller capacity round by holding a .308 Win. or .30BR reamer short? The tapers may make it too tight for the base of a 308 case with those two, but maybe there is another caliber that would work better when held short. Dies could be created by cutting down existing dies.
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