Tinker: The Seyfried article was in the Spring 1997 issue of BP Hunting. If you don't have access to that issue, PM me and I will copy and send.
I'm envious as all get out about you rpinfire double rifle. Please keep posting.
Sounds like the gun was egulated with lighter loads, eh? Wonder if switching to a faster/cleaner powder, such as Swiss, would get the ball out the bore earlier in the double rifle up-and-away continuum, allowing you to print closer with stiffer charges.