i was working up loads for my new rem 700 .308win using win once fired (factory) brass, win standard primers, hodgdon varget powder, and 180 hornaday interlocks as well as 180gr nosler accubonds for bullets. i loaded 20rds started at where the book said too 39gr of powder and went up to 42gr the max is 43.5gr. i was shooting the hornaday bullets first to get rid of them and noticed that the primers were backing out of the pocket slightly they were not flattened or anything just backed out, i thought this was weired cause i was at the suggested start grains. i switched to the accubonds to see if this would still happen and it did not. i have never had this problem before the gun didnt do it with factory loads. i was thinking it was that the hornaday bullets were not deep enough in the case although they were seated to recommended overall length. also one of the cases necks split slightly at start load with hornaday bullets, maybe the cases are bad? i would really appriciate any advise on this
