I am looking to get avarmint rifle and was wondering this simple question. Is there any (dis)advantage to either cartridge? I know that the 243 win is a more prevalent and popular round, but the 6mm rem seems to just be an answer and competition in the bore market.

Also, I don’t want a 22 cal because, other then my rim fires, I want to be able to use all my guns for deer. The 22-250'sand 223's don’t appeal to me. Thanks in advance!