I suppose it would have to be a .308 diameter. But it would have to be a round nose projectile just because that's my favorite! 
Founder
Ancient Order of the 1895 Winchester
"Come, shall we go and kill us venison?
And yet it irks me the poor dappled fools,
Being native burghers of this desert city,
Should in their own confines with forked heads
Have their round haunches gored."
WS
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