Originally Posted by Gm54-120

The Knight plugs are made from 416SS but the brazed in vent liner gets weakened by the brazing process. To avoid patent issues and maybe even for safety Knight did not make the vent removable like in a Savage breach plug.

Bestill can set you up with a bushing plug made from 17-4SS like the original Lehigh plugs but the replaceable bushing is made from tungsten carbide. The bushing should last for 1000s of your type of loads.

These plugs cost about $80 DIY or around $125 if he custom fits it to your rifle. If you can take a few simple measurements the DIY isnt hard. He will send it to you based on the measurements he needs from you.

I change vent liners by roughly .035-.037 at the absolute most.