32" 54 cal GM Barrel w/ 15/16" flats & 1:70 twist - The HuntingPA.com Outdoor Community
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post #1 of 11 (permalink) Old 11-24-2015, 12:43 AM Thread Starter
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32" 54 cal GM Barrel w/ 15/16" flats & 1:70 twist

I came across one of these and snatched it up on a whim because of the smaller scale. Just wondering if I should be concerned about my going up to my standard 54 cal hunting load in the thinner barrel? To wit; 120 grains 3f Goex behind a PRB?

Thanks.
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post #2 of 11 (permalink) Old 11-24-2015, 10:13 AM
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Re: 32" 54 cal GM Barrel w/ 15/16" flats & 1:70 twist

I'll wager the 15/16ths shoots better with less powder. Also check the snow after firing. You may find 20-30 grains there on the ground.
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post #3 of 11 (permalink) Old 11-24-2015, 10:17 AM
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Re: 32" 54 cal GM Barrel w/ 15/16" flats & 1:70 twist

Are you hunting elephant? That is more than used by Western buffalo hunters.
100 grains of 2fg and a prb will kill anything the east coast woods can conjure up.
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post #4 of 11 (permalink) Old 11-24-2015, 11:49 AM
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Re: 32" 54 cal GM Barrel w/ 15/16" flats & 1:70 twist

That's the barrel I have in my T/c Hawken cougar. The load I use is 70 Gr of 3F Goex and a .530 rb. Anything over 100 grains, I believe your just wasting powder. That Gm barrel is an excellent barrel! Very accurate with patched rb.
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post #5 of 11 (permalink) Old 11-24-2015, 11:11 PM
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Re: 32" 54 cal GM Barrel w/ 15/16" flats & 1:70 twist

Try cutting that load in 1/2.With muzzys more is not always better.
I'm killing deer with 50grs out of my 45's with no problems.

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post #6 of 11 (permalink) Old 11-24-2015, 11:54 PM
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Re: 32" 54 cal GM Barrel w/ 15/16" flats & 1:70 twist

and I shot 70 gr of 3f in my 62 smoothbore with excellent results. that thing has to kick like a mule!
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post #7 of 11 (permalink) Old 11-25-2015, 09:22 PM
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Re: 32" 54 cal GM Barrel w/ 15/16" flats & 1:70 twist

I have a .54 GM drop-in in percussion that I am going to convert to flint but have not done it yet or shot it either so I can't comment on a .54 GM barrel.

I do have a flint GM .50 barrel though in the same 1/70 twist and it's likes it's powder. Both barrels are 15/16" and 32" long. My load is 100 grains Goex 3f; .495 ball. Mine likes liquid lube much better than paste type like Tracks Mink Oil. Shoots better groups with Hoppe #9 BP lube or Mr. Flintlock spray.

The load book that came with mine say's MAX. 110 grain 3f or 120 2f. These are very good barrels. This .50 will shoot any charge very well but it really sings with a hot load. I shot 2 shots at a pie plate from the bench with mine a week or so ago at 100 yards and both balls were almost touching and dead center. I packed it up and done. The guy on the bench next to me said I must have a bionic eye LOL.
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post #8 of 11 (permalink) Old 11-25-2015, 09:33 PM
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Re: 32" 54 cal GM Barrel w/ 15/16" flats & 1:70 twist

Is this a percussion barrel or flint?
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post #9 of 11 (permalink) Old 11-25-2015, 09:42 PM
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Re: 32" 54 cal GM Barrel w/ 15/16" flats & 1:70 twist

.54 ball has some real thump to it. IMO is hits a good bit harder than a .50 does on deer.
Although the only deer I have shot with one was last year with a short 24" Lyman Deerstalker with 80 grains of Goex 3f. At 65 yards it actually knocked the deer back and down. It smacked it hard. I have taken a few with my Accusporter with a 300 grain xtp and it puts them down quick to but that.54 ball really seemed to have some serious shock power.
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post #10 of 11 (permalink) Old 12-03-2015, 05:48 PM
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Re: 32" 54 cal GM Barrel w/ 15/16" flats & 1:70 twist

I replaced my factory T\C 50 cal with a GM 50 cal barrel. Best thing I could have ever done. The GM 1-70 twist is oh so very accurate...and consistently accurate. I shoot a conical but a PRB will be just as accurate. I use FF powder and 100gr. and I have shot a pile of doe and a few bucks with it. I'm sure you will be very happy with the barrel. The best way to know what will work is to go to the range and try different loads. Then, you will know.
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