I shoot my SilencerCo Chimera-300 on both my 300-WinMag rifles (Barrett MRAD / MPA 300-WMBA) with accuracy that's super-consistent. When I miss the bullseye ... it's always my fault, not the can's. Highly recommended. I use the ASR brake for quick-mounting ... it's awesome.
What else is important? Length? Weight? If length isn’t a big concern an ultra 9 would probably be great. I use an omega on multiple hunting rifles including a 300wm. It’s on the shorter side, pretty light and suppresses even 300 well. I also have a rugged radiant in jail that should be a great do all can as it’s modular and light.
TBAC 338Ultra SR on mine. The sound is my favorite of all my cans. Really quiet and my last range session finally worked a 5 shot 1 3/8" group at 500y, so it definitely is accurate.