Anyone here loading for a.308 AR 10 carbine with carbine length gas system?165 gr SST worked well with IMR 4064 but I wanted to use the Sierra 155 gr Palma Match to get the velocity up in the 16" barrel. I tried CFE 223 but it seemed over gassed well below max and accuracy is inconsistent. IMR4064 is giving better accuracy but still a bit over gassed . Any suggestions besides an adjustable gas block?Maybe a powder slightly faster than the IMR 4064?