Seating needs a lot of pressure on the press arm even with sizing wax around the neck - impossible without and will buckle the shoulder if attempted. Could this be neck thickness? I've not gone down this route yet (neck thickness and turning) and would rather not either.
.308 Sako case, neck sized and on their 1st reloads (fired 1st as factory ammo).
Sierra 165gr BTSPs
redding seating die (with aftermarket micrometer adjustment) and redding press.
Have been reloading with this caliber and number of others for some years now and not had this problem. Any ideas?