are you using low pressure 3" reloads? If so, and the forcing cones are not too steep, you will be just fine. I know thats not the answer you were looking for, but its true. Pressure is much more important than 1/16" of hull length. Lots of 67mm euro shells out that the maker states are fine for 2&1/2" guns, one fired they are about equal to our 2&3/4" hulls. I like the safety margins of my handloads in 2&3/4" hulls just fine.
Steve

Firearms imports, consignments


[Linked Image from i.imgur.com]