Shooting my wife's .243 youth handi, one out of every 5 shots resuled in the action opening.
The loads were with 100 g Hornady round nose. All loads were sorta hot, about 1 grain under listed max. I was using H4895, Varget, H4831, and Win 760. One of my manuals listed magnum primers for a couple of the loads, well, for simplicity I used them for all - probably a bad idea.
Anyway, the groups were not bad, except the fouling shot for each group hit 6 inches high (cleaned with boresnake between powders)and the shots that opened the action hit 6-8 inches high. These shots pushed out the primer slightly. The shots that didn't open the action showed no obvious signs of pressure (it would have to be obvious for me to recognize.)
Factory 100g loads didn't open the action, but showed bad vertical stringing. The stringing could be because I shot them first on a clean barrel and hadn't settled on sand bag placement, yet.
75 grain v-max reloads never opened the action.
The rifle has about 50 shots through it.
Questions:
-Is action opening common with these rifles?
-Did overpressure open the action AND push out the primers, or did the action opening let the primer back out?
-Could the action be opening because thje front bag was rested under the hinge?
-Any suggestions, besides don't be in a hurry, follow exact recipes, and work up from start? (I should know better.)
Thanks
