The Firing Line Forums - View Single Post - 44/45 Magnum VS. 45-70 Do_All-Levergun

B.L.E. · August 30, 2012, 04:17 PM

I dunno, a lot of .22's had microgroove rifling and seemed to work just fine with lead .22 lr bullets.
I don't think it's the rifling but the size of the microgroove bores that was the problem.
Sport45 claims that cast bullets have to be sized to .432 to work well in those barrels.
Jacketed bullets are actually copper patched soft lead bullets and it may be they more readily upset to seal a slightly oversized bore.

August 30, 2012, 04:17 PM	#29
B.L.E. Senior Member Join Date: December 20, 2008 Location: Somewhere on the Southern shore of Lake Travis, TX Posts: 2,603	I dunno, a lot of .22's had microgroove rifling and seemed to work just fine with lead .22 lr bullets. I don't think it's the rifling but the size of the microgroove bores that was the problem. Sport45 claims that cast bullets have to be sized to .432 to work well in those barrels. Jacketed bullets are actually copper patched soft lead bullets and it may be they more readily upset to seal a slightly oversized bore.