I cast some bullets with a lee C309-120-R with gc, sized to .308. The load data calls for 1.680 COL, but they wont easily chamber in the ol .30 carbine at that length. I had the slap the bolt closed with my palm to get them to chamber. I fired 2 rounds that way before realizing the problem. They registered 1600 and 1608 fps, with 10.0 gr H-110 (starting load). At 1.605 (.075 shorter) they will chamber and leave just the slightest indication of touching the rifling, but is there a potential pressure problem at this length? Data for the 110 gr fmjs Ive used in the past also calls for a 1.680 seating depth, which works just fine. The problem is the ogive of the cast bullet; its fatter at the nose and touches the rifling before the bolt locks.