I'm new here also so unfortunately don't have your answer, but I know it would depend upon how you made you 300 whisper cases. If made from .221 fireball brass necked up it will differ from Military 5.56 shortened and necked down. ;)
Which way are you going to be making your 300 Whisper brass?
I'm new here also so unfortunately don't have your answer, but I know it would depend upon how you made you 300 whisper cases. If made from .221 fireball brass necked up it will differ from Military 5.56 shortened and necked down. ;)
Which way are you going to be making your 300 Whisper brass?
I don't have a whisper but I have been working on building a sort of a wildcat.Its been done before i think I'm necking down a 357 Maximum case to .308 the case capacity might be close to whisper.
thanks.