Hello, first time posting on a forum. I'm looking for some advice on the best grain for my rifle that'll give me more constantly. I'm by no means a marksman so if I'm already shooting the proper grain, then I'll know it's just me lol. I have an 18" Ruger American Predator chambered in 308 (1:10"). I have a Silencer I Omega 300 suppressor attached via an ASR mount. I've shot 150 and 165 grain bit seem to not have the most consistent groups. At 100 yards I'm averaging 2-3 inches but I'm still getting random flyers. Is there a better grain bullet that'll help with consistency?