I had a ruger 77 30/06 re barreled to 35 whelen last spring, and the smith made a mistake and put a 358 winchester barrel on it. I was in a hurry for the gun as I was leaving for the bush for the summer/fall so he stayed late one night and put on a new barrel.
I had 40 rounds of factory stuff that I put through it first, the rifle shot extremly well and I had no problems. Then I had our bush pilot reload some 225s for me, this guy is a real savvy gun nut and owns 3 whelens himself. Anyway about half of the rounds he reloaded would not shoot, the primer was dented but not hard enough. I thought maybe he was setting the shoulder back to far. Now that I am home I reloaded 40 rounds, 20 225 accubonds and 20 250 NP. All of the 225s I have shot a (about 10) have went off OK but even though according to the nosler reloading book they are medium loads they are to hot for this gun. Im getting flattened primers with this load.
So today I tried the 250 NP behind 59 grains of RL 15 this load is way to hot for my rifle and out of two rounds one didnt fire. I didnt try any more as the round that did go off left me with a sticky bolt and pancaked primer. Could I have a headspace problem? Would that cause these rounds to show higher pressures? The 225 load was just over 2600 FPS.