Well, generally if you have to beat the bolt open with a rubber mallet, you hit some high pressure around 90KPSI. Other than that, primer signs really depend on teh primer. Winchester shot good pressure sign, but federals are very soft and appear high pressure most of the time. Now if you find a load you like and on your third firing of the brass you can real easily seat the primer or it falls out, your probably kicking in the 65 to 70K PSI range.