I worked up a load for my ruger 243 last year. The data came straight from hodgdon's website 95gr nosler partition,h4350. The starting load was 39gr and the max was 42gr. I settled on 40gr accuracy was great and all was well. Today I go to shoot and after the first shot the bolt would hardly come back to extract the brass shot it again same results primers were a little flattened. I have heard of strange pressure spikes with the 243 but its hard to understand why this lot of ammo would be fine last October and not now.