sproulman
Interesting? I never even considered this but would it be any different than standard loads in a center fire and magnum charges in a center fire? Shooting mag charges of smokeless certainly accelerates throat erosion. Would not the hotter temps of 3f cause maybe the same thing? I would really hope the number difference is not that high. 3 to 10 is not a good ratio. Another factor that mightadd to this problem would be the tightness of the projectile in the seated position and the force need to drive the projectile out the barrel. The tighter all is the greater pressure and temperatures that are built up in the barrel.
Just my iniatial thoughts when I read you post...