well I consider myself NEARLY an old fart
I agree with above statement with one small change....A 140grn projectile with minimun MV of about 2,600 blah blah blah the size of the shaft/hole/shank isnt going to matter much unless taken to really extreme ends of spectrum......243=6mm 264=6.5mm .277=7mm .284 =7mmand a bit .308=7.62mm etc etc
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