I recently loaded some BTB 0.432 290 LFNGC for a 444 using Marshall's tried and true load of 57 gr H335, WLRP and Remington brass with a COL of 2.54". The load is compressed and I am having trouble getting a consistent COL, it appears that the case tension is not sufficient to hold the bullet in place. I am seeing variances as much as 0.015". The dies are RCBS and I am expanding just enough to get the gas check started. Crimping is with the Lee Factory Crimp Die. Any ideas?