Suppressor accuracy

[GStephen]

I don’t have a problem with my rugged Razor can on my psa 308 at all(sub moa), but when I put it on my psa556 with 18” BA barrel it sprays rds like a shotgun.  And my 22-250 is not very good either.  The can shoots great on my Ruger precision 17hmr also. But I wasted a shitload of ammo trying to use it on the 556. I gave up and put a flash hider back on and earplugs and started over.  Frontier 68gr bthp match are best and Hornady black 75 are pretty close 2nd place.  50 yards testing.  I put my thermal scope back on the 308 for now and the can.   When I tried to put the thermal and can on the 556 I missed 2 coyotes shooting of a tripod that should have been easy. That’s when I figured out that I had a problem.  I thought the gun was a pos or something was loose. 
 I doubt that I will ever try to get a can for the 556 or 22-250.  But I find it interesting that I had such bad luck using my only can on several guns.