Warpspasm
Ultimate Member
I just measured my barrel and it appears I must have one of the early Great Plains Rifles because it measures 33 inches. Is that a good thing?
I just measured my barrel and it appears I must have one of the early Great Plains Rifles because it measures 33 inches. Is that a good thing?
In my experience, a 1 in 66 twist is excellent for a .50 caliber patch ball. Since I have never shot the GPR with a 1 in 60 twist, I don't know how much of a difference there is.
I do know that my 33 inch .50 cal GPR Flintlock will put five balls into one ragged hole about the size of a quarter at 50 yards from the bench with a .490 ball, .015 patch, my own patch lube, a felt wad and 60 grains of Swiss 2 F powder. That's with the existing open sights that came with it.
I have built about 14 front stuffers over the years and have owned many more. For the money, the Lyman GPR is the most accurate I have seen for a production rifle.