Barrel is #3 medium sporter, 1.25" at the action, .63 " at the muzzle. 25" long. Working up loads was kinda an adventure. It appears most reloading manuals are geared for the 96 mauser which isn't all that strong and I think they try to hold pressures around 45,000. However, I can stand quite a bit more in my rig but was on my own to figure it out. I found an old Hodgdon manual #26 which worked out great. Although the load I settled on (max in the Hodgdon manual) is probably plenty warm, I am getting absolutely no pressure signs.
Phil
