My .308 gas gun has a relatively short barrel and I’m trying to get some velocity back by mimicking MK319 mod 0. Issue is I’m looking at N133 and IMR 3031, N133 has a max load with my bullet of 39gr while IMR is at 44. Other forums people are loading it was 44gr of N133 with no signs of over pressure. Just trying to make sure I don’t blow my gun up.