Josmund
I have an original Lehigh Vent Liner in one of my 50's that I have at least 300 shots through and yesterday after reading one of you posts, I did measure it with a pin guage. It will accept a .033 but will not take a .034
All T7-2f and most of those shots would be with 120 grains of T7.
Original Lehigh Vent liners are drill .031 +/-