Both the Savage, and the Lehigh vent liners arrived here yesterday.
I began with the install of the Lehigh, and it seemed to work quite nicely. The unmodified Accura breech plug on the left, the modified Accura breech plug centered, and the unmodified Omega breech plug on the right.
Then, i gave the savage vent liner a try, and it also fit nicely.

I decided to install the Lehigh vent, and loaded the Accura that has factory open sights, with 105g BH209, Harvester Smooth Sabot, 300g xtp, and W209 primer.
This morning i headed for the hills, set out a target, and moved the truck to the place i normally park it, which turned out to be 101yd from target according to the laser range finder.
The first shot was into a stump, and then i fired 8 shots at this target:
The rifle appears to be shooting some high now, with this modification. Ignition was instant, and i ended up loading and shooting the rifle about 16 times before going hunting. Blowback may have been less than what it was before being modified, but then again maybe not.
After returning home from hunting, i replaced the Lehigh vent liner with the Savage vent liner, and will try it out tomorrow morning.