RE: Don't OverDrive PowerBelts-Pics
I have had similar thoughts for years - in fact, I talked to the CVA folks about this at the 2005 SHOT show. My suggestion was to make a magnum powerbelt - that had a little antimony in the lead, and would make that "window" where the powerbelts obturate into the rifling a little higher on the velocity scale. They didn't seem too interested, citing their current bullet was the most popular on the planet.
But the new Platinum Powerbelt appears to be an effort to satisfy those exact same concerns . . . .