So I bought the fix impact 30 cal about a month and a half ago and it shoots great. I then bought a slug liner to do some long range hunting on my brothers farm. It seems that I can only get the nielsen 47.2 grain slugs to fire around 930fps and when shot at 100 yards I can’t get them to group any tighter than 2 inches. I have turned the reg and hammer up and still no luck to break over 950fps. The reg is set at 150 bar and the hammer is maxed out as far a I can safely go. Ps the barrel is a 700mm. Is there something simple that I’m missing or do I have to buy something like a dual transfer port to accomplish that speed