I am new to this forum and look forward to catching up on the hobby.I have a 280 improved on a pre 64 model 70 action that I haven't shot in years.Brass has been reloaded many times and I am going to discard it and start over.All my data is on 140 and 150 grain bullets.I want to take it Elk hunting and work up some 160 grain loads.Is blowing the case out going to make enough difference that I can't creep up on a load while fireforming new brass?Be very surprised if I use more than the 60 grains the standard case will hold. Kill to birds with one stone.Will be using Reloader 22 and stop when I see the primer start to flatten any.Not trying to make it a 7Mag.