If your reloading go as short as you like. If I did one nowadays I'd go straight to 16 or 18 inchs and be done.
This is based one the fact even at 2600fps a 143 or 147 will kill beyond what most people should be shooting at game. The PRC will hit this easily reloading.
Personally I'd go creedmoor. I run a 22 Creed that's 18inchs and I regret not making it 16 and it's even more overbore than a 6.5prc.
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