Again gents I need some advise or help. This past week I was doing some load development with some 162 AMAX in my Cooper 280 AI ( I ran out of Berger 168,and have not got into get more), so guys I started at my ladder test at max clip length 3.87 ,and started at 58GR of H 4831sc all the way up to 61GR . Guys the 58GR showed promise at about .6inch group at 100yards the rest of the loads ( 3 shot groups) were not very good with the exception of the 61 GR group a ragged hole , I know great I found a load BUT this is where I need the advise , the 3 shot group at 59.5 GR flattened primers slightly , and the 60,and 61 GR no flat primers??? guys does 61GR sound to hot as I had no other signs of pressure no sticky bolt nothing just want some thoughts on the 59.5 GR charge , and maybe a different primer change or maybe going to Mag primers ( I thought Mag primers would be to hot) I currently using Fed 210 primers . I think I will load 6 more of the 58 GR ,and 6 more at the 61 GR, and try again any thoughts or suggestions would be great . Guys no I did not chrono any of these loads ,as that may have told me more info .