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| |-+  Black Powder Shooting
| | |-+  .58 cal patch/ball
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Author Topic: .58 cal patch/ball  (Read 1233 times)
varsity07840
Starting Member
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Posts: 49


« on: October 12, 2010, 08:09:42 AM »

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
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smylee grouch
Hero Member
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Posts: 1920


« Reply #1 on: October 12, 2010, 08:41:44 PM »

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
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Harnic
Guest
« Reply #2 on: October 12, 2010, 09:22:31 PM »

My choice would be the .575" ball too Duane.
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Daryl
Guest
« Reply #3 on: October 13, 2010, 10:30:51 AM »

Yes - I'd use a .575" with a 10oz denim patch or ticking- either .020" top .022" thick.
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