I have been fighting with a new AR purchase that suffers from FTF's. I have narrowed it down to what I believe is a charge weight problem. I ran 23gr of RL-15 behind a 75gr Hornady BTHP and had no problems. I increased the charge weight by .2gr increments and began suffering FTF's around 23.6gr. After that they became more definite up to the max charge tried of 24gr. What would cause the bolt to short cycle due to higher velocity or higher pressures? I plan to load for this rifle around 23.2gr being as that's where it seems to be most accurate so it's not necessarily problematic but this is still a issue that none of my other AR platforms have. I don't want to have problems with this in the field.