To start off I am, only a year experienced in reloading. Been having some real good results in other calibers but the 243 is testing me. Rifle is a tang M77 with 18 lightweight barrel. Loaded 85 gr Sierra BTHP with 34, 35 36 grs IMR 4895. OAL length of 2.60 to start. Cool dry temp of about 58degrees no wind. All groups are 3 shot groups. Results are, 34 gr 1.233 35 gr 1.361 and 36 gr 1.043. started with a clean bore and a fouling shot. Barrel never got real hot. My conclusion is it seem s to be shooting better with more charge. The lymen book shows a max load of 38 gr. Still have room to load up but...... all the primers except for maybe 1 per group are not seated flat after the shot and pushed out( sorry for not having the right terms) max is .011 in the 34 gr group, .012 in the 35 and 36 group. This measurement being from the worst of the 3. Now there was no problem extracting and shows no other signs of over pressure. Primer strikes look good with no crater that I can see. What could cause this and should I be worried? I am because I think somethings going on. Wrong powder maybe? Is pressure too high? Maybe not enough pressure for the bolt to reseat the primer? Is .012 acceptable? I doubt but I need some advice before I move ahead.