New barrel with a conical twist - The HuntingPA.com Outdoor Community
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post #1 of 14 (permalink) Old 04-13-2014, 04:08 AM Thread Starter
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New barrel with a conical twist

I recently picked up a Green Mountian .50 cal LRH barrel made for conical (1 in 28 twist) for my Renegade. I've shot 36 rounds through it and I cant seem to hit my point of aim at 50 yards very regularly. Some shots are dead on and some are off a bit by up to 6 tp 8 inches. I've changed up my load from between 80 to 110 grains of powder (APP) with no consistent grouping. I have been only shooting Hornady GP bullets.

Do barrels made specificaly for conicals (ie ones with a fast twist rate) still get picky about what they like to shoot?

Also could this be attribited to "break in" period since the barrel was new? If so, what is normal for a break in period?

Thanks
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post #2 of 14 (permalink) Old 04-13-2014, 10:19 AM
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Re: New barrel with a conical twist

What do you mean by LRH Some of the fake powders don;t compress evenly from shot to shot and give different inconsistent ignition speeds and pressure curves.

Increasing the powder in such a short barrel, often just means more recoil and resulting flinch.

If it is a flintlock, ditch the powder and get real black.

Sights loose?

Conicals are very finicky about barrel fit and fouling.

Without watching you load and shoot, there is not much more to suggest.
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post #3 of 14 (permalink) Old 04-13-2014, 08:53 PM Thread Starter
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Re: New barrel with a conical twist

LRH - Long Range Hunter by Green Mountain. Its 28" long

Not shooting a finter, but a percussion TC my wife got me. I added the new barrel.

I've heard similar concerns about substitute powder not compressing evenly and being inconsistent but this is rediculous if its the powder. I cant get three shots to group.

Sights are tight.
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post #4 of 14 (permalink) Old 04-13-2014, 11:36 PM
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Re: New barrel with a conical twist

Very well may be the powder...especially with vertical stringing...that's can be a sign of pressure changes... Which would make sense...packed tighter would increase pressure..not so packed and not as much pressure...


6-8" worth? I don't know....



What conical are you shooting??



Sabots might work well too in that fast of a barrel....
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post #5 of 14 (permalink) Old 04-14-2014, 08:30 PM Thread Starter
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Re: New barrel with a conical twist

Mauser, I'm shooting a .50 caliber Hornady Great Plains bullet.
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post #6 of 14 (permalink) Old 04-14-2014, 08:53 PM
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Re: New barrel with a conical twist

I have the same barrels, one in cap one in flint, 100grs FFFg blk powder 25o gr Hornaday sst 1 1/2 to 2 " groups at 100yrs off a bench. Put a 8 pt. buck down this past flint season at 85 yrs one shot straight down
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post #7 of 14 (permalink) Old 04-20-2014, 01:36 AM
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Re: New barrel with a conical twist

Quote:
Originally Posted by nca225
Mauser, I'm shooting a .50 caliber Hornady Great Plains bullet.
I could be wrong but doesnt the Hornady Great Plains do best in a slower twist barrel? Could be wrong as I don't use them. In a 1:28" twist I would think a sabot would be best, or maybe a powerbelt.

Also agree real black powder is always best.

Semper Fi
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post #8 of 14 (permalink) Old 04-20-2014, 10:19 PM
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Re: New barrel with a conical twist

1-28 is NOT the ideal twist for a conical.... 1-32 or 1-48 is better suited for a conical??? Hornady GP bullets are great bullets.... And the break in period in a muzzleloader is hog wash...
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post #9 of 14 (permalink) Old 04-22-2014, 07:56 PM Thread Starter
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Re: New barrel with a conical twist

I'm researching some different conicals for my GM barrel. Anyone try these?

http://www.prbullet.com/bullscn.htm
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post #10 of 14 (permalink) Old 04-29-2014, 01:13 AM
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Re: New barrel with a conical twist

A 1:28 twist is ideal for sabots. I have two barrels for my RMC accusporter one is a 1:28 and the other is a 1:48. I got a doe in the flintlock season with a sabot and a 300 gr Hornady XTP. I plan to put the 1:48 twist on this year and shoot bore size conicals but have not done it yet.
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