I'm starting with 2 Remington 700 bbls., 26" (actually 300 mag). I will cut the chamber areas and rechamber to 30-40 Krag. I expect the final length to be 24"+/_. Right now I have some old original ammo with the heavier bullet than modern ammo, 200+ grns, I think. We're away from home right now so don't have it with me. I expect current production ammo would be a better choice for the regulating process. I looked at a Westley Richards site wherein they regulated in as few as 8 rds, and as many as 100!