Where does one buy a barrel that shoots paper patched or grease grooved bullets? Muzzleloading that is.
I think we need a little clarification here.
A bullet barrel is a bullet barrel. How the bullet is loaded makes no difference. Saw the chamber end off a BL barrel and install a breechplug and its a ML barrel.
Basically if someone is selling ML bullet barrels as something different than a barrel for a BPCR or other cast bullet application its
snake oil.
The projectile type, PP or GG, makes no difference in rifling form or groove depth. The only difference would be false muzzle and these are used on both vintage and modern breechloaders are well as MLs.
The only difference would be if picket bullets are being used but these do not need a true "bullet" twist being in the 30" to 48" range in most cases.
Before the business sold plains rifle length 50 and 54 caliber RB barrels were available from Badger.
If they make a barrel in the weight/contour needed Green Mountain is a good choice for quality/price.
If you want something special try one of the custom CF barrel makers.
Bartlien has been getting very good reviews from very picky modern shooters. They can produce almost any twist you want.
Krieger is good.
Both make single point cut rifled barrels.
I think both can do very heavy contours on special order.
There are others.
I prefer cut barrels to buttoned.
I would avoid gain twists for bullets. Very slight gains are good but the rapid gains historically used in picket/PRB rifles do not work well with long bullets.
If you can get a contour that matches the need Green Mountain is good from all accounts. They make a number of contours matching many of the old Winchester contours including #4 and #5. But these are still light by slug gun standards. I have only used one and the customer was happy with the result.
I used a number of Badger Barrels before the sale but never got the last 3 barrels I ordered just before the sale took place.
I have no reason to think the quality is worse now than before. My personal BPCRs both have Badger barrels.
Dan