Walt,
the hole acts as a stress concentrator which can be visualized by imagining the stresses flowing in that area compressing as they go around the hole.
The problem is that its impossible to calculate that geometry as the thin wall between the barrel ID and the hole may fail but you don't know about the chamber material.
Sleeve the barrel and sleep at night.-Dick

Last edited by Dick_dup1; 05/10/11 08:01 AM.