AmericanLongRifles Forums

General discussion => Black Powder Shooting => Topic started by: varsity07840 on October 12, 2010, 03:09:42 PM

Title: .58 cal patch/ball
Post by: varsity07840 on October 12, 2010, 03:09:42 PM
I recently acquired a .58 cal barrel with the following specs.
.580 bore
.012 groove depth
8 wide grooves/narrow lands-similar to Forsythe
1/70 twist.

Ordinarily my load recipe would include a .570 ball and .018 patch, at least for starters, but I'm thinking the very narrow lands/wide grooves, .012 depth may
require a bigger ball(.575?) and/or a thicker patch.

Comments will be appreciated.

Duane
Title: Re: .58 cal patch/ball
Post by: smylee grouch on October 13, 2010, 03:41:44 AM
That sounds like the two GM 58's that I made, 570 worked great in them, 110 gr. 2f and maybe alittle thicker patch.    Gary
Title: Re: .58 cal patch/ball
Post by: Harnic on October 13, 2010, 04:22:31 AM
My choice would be the .575" ball too Duane.
Title: Re: .58 cal patch/ball
Post by: Daryl on October 13, 2010, 05:30:51 PM
Yes - I'd use a .575" with a 10oz denim patch or ticking- either .020" top .022" thick.