I'm hooked into 260 Remington pretty deep, bought into that caliber before 6.5 came out and I have so much brass AND a ton of factory loaded Gold Metal Match and Hornady ELD-M ammo for it that is why I use it.

That being said, here's whats going on and I want to kinda run it passed the forum here to make sure I'm going in the right direction of thinking or if I'm WAYYYYYY out in left field.

Les begin the trouble shooting below shall we.....
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I purchased a Saturn Barrels 18in 260 Remington barrel with rifle length gas. At first I was having nothing but stove pipe/double feeds. Got an adjustable gas block and a DPMB Dual Extractor Bolt and that solved the issue of that. Damn gun runs at 7 clicks open unsuppressed and 1 click open suppressed on the gas block. I had this issue on all the platforms I've tried this barrel on so I'm pretty sure the barrel is way over gassed hence the adjustable gas block. I started noticing, especially when suppressed, that after about 10-15 rounds, when the rifle really starts to heat up, I'm literally popping every primer on every shot.

Am I correct in thinking that this chamber is undersized an as the rifle builds up heat is causing massive pressure issues? All I have been shooting is factory loaded ammo that I got pre-insanity pricing via RSR Group and Davidsons, I got a couple thousand rounds of each. This issue happens with both the Federal Gold Medal Match 142gr ammo and Hornady 130gr ELD ammo.

I need to get a Go/No Go gauge and a chamber reamer. Anyone know where I can find those?

Just some info on the rifle itself. It is a DB10 that runs 100% with 308 barrel. I have 2 others in 308 that run absolutely amazing (granted, those both have the barrels replaced with Ballistic Advantage barrels and DPMS Dual Extractor Bolts) I've tested this 260 barrel on multiple other AR10 platforms with same results.