Originally Posted by ronlaughlin

Drilled out my Accura plug this morning. I forgot to fire it yesterday, before i came home, so i went up into the hills a little ways, and fired it this morning. It was a hang fire, and that surprised me. When i went to measure drill depth, i discovered that i have been short drilling the carbon with the 7/64 drill, leaving some carbon in the flash channel. This may the cause for the hang fire this morning.

Anyway, i carefully studied the depth to drill the 5/32 hole, and drilled out the flash channel. Then i used a 3/8" drill and deepened the concavity on the muzzle end of the breech plug just a little bit. This work left a flash hole about 1/8" long. It surprised me how easy the breech plug was to drill. I used oil for lube and both drills cut the steel readily.

Figured i should test the rifle, so i headed for the hills, set up the target, parked the truck in the same place as usual, and fired away. The rifle didn't seem to be as accurate as it was with the unaltered bp, but perhaps it was me. After 8 shots i moved the rear sight some and shot 3 more times. These last three shots made a 2 1/2" group at around 100yd. The altered breech plug changed the point of impact some, but i noticed no change in blow back or spent primer removal. There were no hang fires with the altered breech plug. The rifle fired right now.

When the vent liners i ordered arrive, i will install one and go from there. My goal was and is to make more of a concavity on the end of the breech plug. This can't be done without the vent liner.