The chambers on my GP sample are oversized, but turns out my calipers are better at outside measurements than inside measurements.
I was getting .434+, which would be grossly oversized, and to be fair to Ruger had my gunsmith do his own measurements with better equipment today as a double-check.
He got:
430.5"
430.5"
430.0"
427.0"
428.5"
Not knowing at this point what Ruger considers standard, I also took along my first-run Lipsey's Blackhawk Flattop from when they first brought those out.
He got:
428.5"
428.0"
428.5"
428.0"
428.5"
428.5
I'd conclude if Ruger'd take those GP throats down to 428.5 or 429, and make 'em consistent, the gun would be a more consistent shooter.
The Blackhawk's not picky about bullet weights or diameters, and anything above 428.5 gets through with minor compression that doesn't seem to adversely affect accuracy.
Many of the jacketed bullets I see are 429-430, and a lead bullet as high as 431 can still do well.
Denis
I was getting .434+, which would be grossly oversized, and to be fair to Ruger had my gunsmith do his own measurements with better equipment today as a double-check.
He got:
430.5"
430.5"
430.0"
427.0"
428.5"
Not knowing at this point what Ruger considers standard, I also took along my first-run Lipsey's Blackhawk Flattop from when they first brought those out.
He got:
428.5"
428.0"
428.5"
428.0"
428.5"
428.5
I'd conclude if Ruger'd take those GP throats down to 428.5 or 429, and make 'em consistent, the gun would be a more consistent shooter.
The Blackhawk's not picky about bullet weights or diameters, and anything above 428.5 gets through with minor compression that doesn't seem to adversely affect accuracy.
Many of the jacketed bullets I see are 429-430, and a lead bullet as high as 431 can still do well.
Denis