Long time lurker with a challenge; I am recently loading for a Remington 7mm RM PSS I bought a year ago, and I have ran into a problem with loads. I cannot get full length sized rounds to chamber in this rifle! Details; 1. Two different dies, RCBS and Redding, neither of which work. Both dies size to specifications (neck, head diameter, etc) via caliper as sort forth in Hornady, Sierra, and Nosler manuals. 2. Cases which do not "fit" the PSS slide into my Savage 111 smooth as silk. 3. Chamber was polished out by local reputable gunsmith. 4. Out of the bag Winchester brass, with no prep what so ever, chambers great (that really confuses me) Am I missing the obvious?