Nearly 2 months have passed since i received the breech plug & adapters from Precision Rifle. To me the most notable thing thus far, is how magnum rifle primers seem to be far less abrasive than shotgun primers. One of the OEM Omega breech plug that was modified to accept the adapters, now has 180 shots through. The flash hole is today, the same size it was when newly modified.. 0.032". Past experience tells me had i been using shotgun primers, the flash hole would have grown by 0.005" or so, in 180 shots. Using shotgun primers seems to kinda be like running a sand blaster through the breech plug. This is quite surprising to me; i never woulda thought.

Are you talking factory flash holes or ventliner wear? The reason I ask, I tested several Encore plugs and always replaced at 500 shots using federal 209A primers. The old Encore and Omega shared plugs together. No modifications at all to the plugs I tested.

OEM Omega plugs have a 0.028" or 0.029" flash hole, and a 1/8" flame channel. The PR Omega plug has a 0.032" or 0.033" flash hole, and a 1/8" flame channel. After shooting 180 shots the OEM flash hole will grow by about 0.005", or perhaps more. The PR plug flash hole was the same it was when new. Results seem to indicate that shotgun primers have a very much more abrasive flame than magnum rifle primers.

Vent liners have nothing to do with these results.

After 2 month, it seems the flash hole of the breech plug which uses rifle primers, doesn't erode when using magnum rifle primers. It seems that the flame of shotgun primers is highly abrasive, and the flash hole of breech plugs using 209 primers just grows, and grows with each and every shot.

Results after only 2 month, are just that, short term results, requiring much more shooting..isn't that nice!