FIGJAM
Well-Known Member
both
Is there a reason you have narrowed it down to those two cartridges? For paper punching either of the ones you have listed will work. I would choose a 7 RM since it has a little less recoil.
Honestly if you are building a custom I would look at a different round for paper punching and target work. 6.5 saum, 6.5 PRC, 7mm wsm. Its not that expensive to change the bolt face either - so 6.5x284 280 AI etc should all be considered. Just don't build an effing creedmoor! Lol