Is the primer cup material on large rifle mag primers thicker and stronger than standard rifle primers? After reading the fine article by Byron Goff, I decided to blow the dust off of a Kettner action chambered in 6mm Krag long. Every 3rd or 4th round the primer ruptures in the on the edge. The problem is the 2 holes used by the spanner to remove the fireing pin retainer extend slightly under the primer, not a problem with the modest 8.15x46R is a problem with the higher pressure 6mm Krag. Any help appreciated. Thanks Mike

I would think not.  BUT, a pair of calipers would tell you immediately.  Might could be a good question to pose directly to the manufacturers.

Thickness is one consideration in the strength of the material.  Material composition and hardness (brittleness) is another - also influenced by the shape and depth of penetration of the firing pin.

Another consideration is the sharp increase in pressure (a little increase in velocity) when the primer hole is enlarged.  (See Phil Sharpe's volume)

Rather than risk erosion of action face from blown primers..why not just reduce loads?