Thread: suppressor pressure

I've had two other rifles with suppressors and never had this. Wouldn't everybody have to reduce loads then when using a suppressor? I've heard of velocity gain by using one but it seems no one really sees it or only very minimal if at all. I've gained more pressure than 3gns of powder probably closer to 5 that's almost 10% reduction needed. Seems way to much. It's a carbon fibre barrel so probably has a bigger internal sleeve so being the same od and length I guess internal volume might be a bit less to handle the gases and maybe it ism't enough? but then a 7rm mag would have 5+ grains more powder and that would balance it out as thats more gas to sort on a more standard one. The rifle does seem to be shooting fast. book says a 175projectile 66gns of powder is about 2850fps. I get that with 62.5 and pushing 2950 at 65gns. this was with a magnospeed. The chamber seems long as a no go gauge works easy but I size the brass to suit. 30" jump so no jamming.