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Cirus97

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Lyman GPH percussion barrel .54
Can’t remember where I got it but never used it. Just handling marks. $300 plus shipping.
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Stevan said:
Oh, shorter than I thought. I am looking for a Investarms (Lyman) to install on Investarms wood. Would this fit? Steve
Click to expand...

It requires two barrel wedges, neither of which is in the right location to fit an Investarm Hawken type rifle.
 
Neel said:
Do you happen to know the twist rate. I have a GPR with the normal 1:66 twist for ball, if it's the faster 1:32 I'll take it.
Click to expand...
The fact that the barrel says “Great plains hunter” tells me it’s the fast twist. I have a Lyman GP with both barrels in 50.

I looked this up:

The Lyman Great Plains Hunter Signature Series .54 caliber muzzleloader has a 1:24"twist rate barrel that's designed to accept modern projectiles. The barrel is also shortened to 30" to make the muzzleloader more maneuverable and save weight
 
TechMoron said:
It requires two barrel wedges, neither of which is in the right location to fit an Investarm Hawken type rifle.
Click to expand...
However this is a simple adaptation that may also require a change to the underrib. Certainly worth exploring.
Jim in San Diego said:
The fact that the barrel says “Great plains hunter” tells me it’s the fast twist. I have a Lyman GP with both barrels in 50.

I looked this up:

The Lyman Great Plains Hunter Signature Series .54 caliber muzzleloader has a 1:24"twist rate barrel that's designed to accept modern projectiles. The barrel is also shortened to 30" to make the muzzleloader more maneuverable and save weight
Click to expand...
Where did you look this up??

Not saying it's incorrect but all the info I've ever seen on the GPH rifle and the barrels indicated 32" and a 1:32 twist.
 

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