I’ve got 4 rifles with Proof barrels including a 28 Nosler with 700+ rounds through it. I’ve used DBC on a number rifles but would not bother with a Proof barrel. I cleaned mine 4 or 5 times during the first 40-50 shots and that was it for break-in, I’ve found my Proof barreled rifles to be some of the easiest to clean I have. My first ones were all large capacity hunting type rifles so I usually clean those around 50 rounds but they seem to exhibit very little fouling. I just got a 18” 6.5 Creedmoor with a suppressor and it’s got about 200 shots without cleaning now, I need to shoot it at paper to see if the groups have opened up.
