Still working with my new 25.06. New Douglas barrel on a Rem. 721 action. Currently I'm shooting Sierra 90 gr with 53.0 grains of IMR 4350. Bullets have about .010's jump. It shoots little groups. Winchester case. Annealed, turned and trimmed to min. length. Upon firing, it is impossible to lift the bolt handle quickly, (like for a follow-up shot). I wait about 10-15 seconds and the handle works fine. Primers show very little cratering, (if any). Any ideas what could be the cause? Also, loaded rounds chamber normally.