I think your approach is correct. I have on old Hellis which appears to have longish chambers also. Don't know why that is the case. I had the chambers on a Fox lengthened and I'm sorry I did. The data does suggest very little pressure rise when firing a 2 3/4 cartridge in a 2 1/2 chamber. Removing steel to relieve the very modest pressure rise seems like a bad idea since removal reduces its capacity to contain pressure. Much better to reload to modest pressures and leave the chamber alone. My 2 cents. Looks like a nice family keepsake to shoot and enjoy.

david vandercoy