Pressure \"spikes\" on Big Magnum Cartridges.... Some of you guys shoot some big capacity cartridges. The weather is turning cooler here and I've kind of semi retired and have some time to try and work with my 30-378 I bought years ago but hadn't shot alot. HERE'S THE SITUATION....I'm at the range the other day finishing off a 6 mo. old batch of 200 accubonds over 118 grains bmg. My notes when I shot the freshly loaded batch said "shoot great" "velocity 3170. This in a stock sako with 26" barrel. Well today I shoot about 8 rounds and they are clocking about 3250....and I get one with a sticky bolt and one more with a realy sticky bolt. The sun was just getting high enough over my chrono where I didn't get readings on the sticky bolt shots. I stop there and go home with my last 3 rounds still loaded. I can't figure out what's going on. Maybe I missed trimming these last ones....no they check out ok. Then I get to thinking that in the past I had noticed that as ammo gets old the bullets sometime take a sort of "set" to the case. I thought I had cured this by swabbing out lube with damp paper towels wrapped around a small nylon bore brush. Anyhow I take the last three rounds and put them in my seating die and try to seat them deeper and sure enough....there is somewhat of a "crack" as they let loose. Have you guys ever experienced this kind of "bullet set" or bonding (if you will) on stored ammo? Am I crazy to think this can have any more effect than....say.....crimping? Is it possible my gun was just "fouling out" and that caused excessive pressure to come on that fast??? ANY OTHER IDEAS PLEASE???????? BTW--I checked a 6 year old batch of xlc barnes loadings and the coating sure keeps them from taking any kind of set. They seated deeper as if I was just loading them tonight. Maybe a couple of drops of flitz in my tumbling meadia is putting a coating on my brass that is "unfriendly" to storage of regular jacketed bullets?