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 optimum twist for a .54 round ball

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PostSubject: optimum twist for a .54 round ball   optimum twist for a .54 round ball EmptyJanuary 22nd 2016, 7:50 pm

I'm getting a .54 caliber barrel made for my T/C Hawken for shooting PRBs. This will be a 32" bbl with a load range of 80-100 gr of FFg. I can get any twist I want so I'm looking at 1:60, 1:66, 1:70 or 1:72. The barrel maker recommended a 1:60 but any recommendations will be considered.
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Standing Bear

Standing Bear

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PostSubject: Re: optimum twist for a .54 round ball   optimum twist for a .54 round ball EmptyJanuary 22nd 2016, 8:10 pm

Any of those will work fine   IF, IF the rifling grooves are at least .010" deep.  I prefer .012".  

The two .54s I've done are both 1/70 (Green Mountain). The one I've shot in starts grouping well at 50 yds w 90 gr Goex FFg and a tight ball/patch combo. A 60 twist might shoot a slightly lighter charge adequately. I doubt you'll see much difference between a 70 and a 72 twist. 
TC
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OldMtnMan

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PostSubject: Re: optimum twist for a .54 round ball   optimum twist for a .54 round ball EmptyJanuary 22nd 2016, 8:19 pm

I answered on the other forum, but i'll condense it this time. I like the 1-70 for a .54 that GM uses.

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FrontierGander
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FrontierGander

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PostSubject: Re: optimum twist for a .54 round ball   optimum twist for a .54 round ball EmptyJanuary 22nd 2016, 9:03 pm

1:66 2c
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