Home Forums Hunting & Shooting Ask The Gunwriters Tight chamber,fast barrel?

I have a Hornady OAL modified case gauge that I use to determine at what length a bullet contacts resistance in the chamber. On my stainless Weatherby Vanguard II .30-06 the bullet stops way short of where 3 of my other .30-06 bolt rifles do. This rifle also starts showing pressure signs and reaches what I consider optimal velocity at fairly low powder loads. For instance with 150 Hornady Interlock or SST and Scenar 155s undue pressure starts showing itself if I load 57 grains of IMR 4350 so I shoot with 56 grains and obtain over 2800fps. Would this likely be due to a tight chamber, as evidenced by a short trip to the lands or a tight bore? Or maybe both? By the way it is easily a sub minute rifle as was guaranteed by Weatherby. I hand load relying on supervision and advice from experienced folks that I associate with, but I admit there is a bunch I don't know so I proceed cautiously.