If it belonged to me I would modify brass before altering the gun. Check with your chamber cast and even better a fresh case painted with machinist marking dye. Tight spot will show up as the dye rubs off
How depends on where it's tight. Check the neck first several ways to alter neck dimensions mostly turning with readily available hand neck turners. If the body is tight use sizing dies, CH4D will have on hand or make correct dies. If the tight spot is near the web, dies won't reduce solid brass. The cases can be reduced in size in a lathe.
I have a 25 Kraig that needs about .002 removed from cases just in front of the rim to chamber properly. Lot easier to turn cases than run the chamber reamer in the barrel and no chance to run the rifle.
Boats
