I am having problems with my 300 blackout. I am running a 8.5 barrel upper suppressed. When shooting 208 hornady amax ammo sometimes the bullet does not fully seat into chamber. I have to use the forward assist to get the bolt to go all the way. Does not happen every time but to often. Happened about 5-6 times out of about 50 rounds shooting today. I am not sure if I need to add an adjustable gas block or a heavier recoil spring/lighter buffer or what. The spent cases look ok besides a slight scratch all the way down them that seems normal and the rim of the case has a dent inward as does every 300 bullet I have ever shot seems to have, indicative of the round I suppose. It always fails in this manner. Everything is fine it just does not always slam the next round all the way home into the chamber. Any advice appreciated.