Originally Posted by ptpyron
Thanks, yes I do measure every round for that reason. I guess the real question I was trying to ask was, Can the size of the chamber effect the pressures to where 85 grains in one rifle may yield 2900 fps and in a different rifle the same charge yield 3100 fps?
If you modify the chamber, throat, lead angle, jump, case volume, etc... the pressure will change. If the pressure changes, the velocity will change.
I would not expect it to make a 200 fps difference based on the info you provided. But, I don't think any of us here know exactly what was done to "shorten" your chamber/throat.