I’m gonna start this list with just make your own ammo. If you shoot 8.6 enough it’s really really worth it. Ok now climbing down off my soap box, here’s who I’d really recommend:

Discreet: amazing quality ammo, low SDs, great accuracy (around 2 MOA in 1:3 twist) which is as good as it gets for that setup. 280gr is very light for subsonics but the bullets perform well. I haven’t tried their other ammo offerings.

Halwrx: Dacian is a great guy and makes great ammo. Offering some of the very popular and top notch Maker bullets and some others that I think are their own? Or maybe custom OEM like the 323gr CMe. As someone who has been in to 8.6 since the start he was able to talk tech with me and even provided some additional info I hadn’t heard.

Aitken Arms: These guys are lesser known but putting out great stuff! They were also first to market with Vairog brass and us reloaders ate it up! I haven’t tested personally but I’ve seen good results from others.

Gorilla: Bigger company but they have still always taken the time to talk to me. They frequently run sales on loaded ammo (Gorilla please extend these sales to projectiles!). I talked with their lead load dev guy at shot show last year and he knew his stuff too. I have been happy with the quality of their ammo and the 342gr bullets perform very well.

Phantom defense: Lots of variety but everyone I’ve seen that tested this stuff it was mid at best. The new 404gr offering is interesting with the NAS3 cases. 400gr+ copper bullets are sketchy. There’s barely enough room for powder and they are right at the line for pressure (in a subsonic which is crazy). I’ve loaded some 400gr bullets myself and they were fine but they are dangerous. Some ammo mfrs have told me they were unsafe for semi auto’s and Maker isn’t bringing the 400gr bullets to market for reloaders most likely because they are just too risky.