My question is my PSA 6.5 creed doesn’t have a 90 dg shoulder. It is more rounded off. I’m wondering if this will cause an issue with my Sigsaur SDR 7.62 suppressor?
Take it a smith and have the proper threads cut. Make sure your barrel has a diameter of at least .725" if you want to use 5/8" threads; the PSA rifles I've seen don't. Best option is to send to http://class3machining.com have the SIG taper done.
I have a PSA 20 inch 308 and run my LTA YHM all day long with no problems. It does not loosen up after shooting, and also is running 0.60 moa at 100 yards with 178 SMK's