I have had no issues with my HK MR7.62 you do notice a difference but no negative effects but with my Savage 10 BA I have had blown primers on my normal loads. I usually run Lapua or Nosler custom brass, 46.0 of Varget with Sierra 168 BTHP Matchkings leaving the barrel at 2900 fps. I was flat spotting the primers that weren't blowing. Today I had a chance to get some downrange, I loaded up 10 with 44gn and 10 with 43gn. 44's were just about the high end of where I need be suppressed. I had good accuracy with 43 grains and no issues due to pressure. I didn't get a chance to measure my fps but I at least have some info to build on and I feel somewhat better knowing it solved my issue. Overall the suppressor runs awesome.