I have read that small rifle primers help save the barrel. If you're using heavy loads of something like RL 26, you normally need a large primer brass.
Now I'm only talking about information on my Ruger Gen 2 and a 20" barrel 1x8 twist. Just a heads up, but it took close to 250 different combinations of powder and bullets before I got what I wanted and the gun would shoot. Don't get too set on what you want to shoot. I ended up with an 80 gr ELDm and 80 gr ELDx. I get almost identical POI with both. I'm using the magic fairy bust RL 26. ( I was very fortunate to land on 3 8-pound jugs before it disappeared)I get less than a 1/2" cold, hot, first, or 50th shot. I found they like to fly very fast. I also found that every Creedmoor chambering will flatten the primer. I use the bolt lift and the presser sign. I get 3500 fps. On a fairly calm day, a rarity up here in north-central MT, but if I'm doing it right at 500 yards, I can get 4" groups. I shoot a Vortex Sonora with a custom dial-up elevation cap. anyway dont just settle for good go for great.