necking down large case ar-15?

ZSteinle

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Has anyone necked down oe of the large boar cases built for the ar15? 450 bushmaster necked to 6mm? 50 beowulf necked to 6mm or 22?
 
There are already such good options that I don't see why someone would want to put that much brass prep into a semi-auto.
Any of the other options like 6.8 SPC, 6.5 Grendel, 7.62x39. Any of them can be wildcat'd easier.
Not to mention the WSSM's that already exist if you're looking for more horse power with lighter bullets.
I don't know if anyones done it, but I would assume that it's because the juice ain't worth the squeeze, so to speak.
 
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