I have a 308 remmy 700 5r with a 24 inch barrel and an older suppressor, I want to say the brand is cobra or something similar. When I first put the can on I tested the rifle POI with and without it attached. The test showed no change of impact plus my groups were tighter with the can on. This was 5 months ago. I retried the test today and had a change of impact while my group with the can on was around 1 MOA, not good in my option. With the can off it was back to sub moa. So my question is why would it change now and not when I first started using it. An additional note, I used hand loads the first time; today I used UK surplus sniper rounds.