Hate to say this, but no such thing really exists from my experiences... Most factory ammo uses bulk canister-grade powder, which is rarely a decently clean-burning powder like we buy in stores...Super and Subs. And the cheaper in price you go for the ammo, the cheaper the price/quality of the components of said ammo are at the factory, as well.
So .300 BLK subs are nasty regardless...Especially most factory options (from my experience). They'll cake up the inside of your can, too. You'll need to clean your suppressor about every 1,000 shots with subs or it will get pretty thick on the baffles. But, about every 250 rounds of subs, shoot a mag of supersonics through it to break up some of that shit, and that will help you run to cleaning it about every 1,500 rounds instead of 1,000.
I handload all mine, and use either Hodgdon H110, Alliant 300-MP, or Hodgdon CFE-BLK and CCI 450 primers.
I began this thread because Andrew, over on a reddit thread, mentioned how warranty requests for repair were increasing in his shop. He thought there *could* be, *might* be, a connection to a few ammo manufacturers. For me, it's hard to say really, hard to make the case. There are so many new folk using cans, so many attempting to spin up on how to not break them. Then, there's Covid Era ammo made from questionable component quality, making its way thru supply chains and stocked up on shelves. But, he thought he saw a connection to certain ammo, with failures showing up on his can repair line. (I asked him for his recommendation for this ammo, but I did not hear back).
I was reading another recent thread on this forum from a fellow describing his velocity measurements on 300 factory supers. Ammo Inc was the worst offender with 100's of fps spread, huge for subsonic velocities. No info on grouping, or cleanliness, just measured velocity spread. The gamut of tested ammo (4 brands, I think) and the results he documented was pretty bad for wide variance, and it lends alot of credence to your observations with subs.
So, with all that and relative scarcity of information on 300 subs, I thought it would be a good topic for supressors. That is, I'm hoping that good ammo will help keep me from damaging my gear. I can apply all that I have learned here (buy good gear from reputable firms, apply correct torques, check alignments, etc), but I should also feed it the good stuff.
Thanks for the tips about cleaning. I noticed a 2020 thread about cleaning cans has been revived this month, some topic that started with "dip", a mixture that I now believe I will steer clear of.
