Join Date: Jan 2010
Location: South Central Wisconsin, USA
Team101; my experience just off the top of my head:
Been shooting muzzleloading guns since the 70's
Rifled, smoothbores cap&ball pistols, caplocks and flintlocks, mostly tradition guns but some inlines, tight-fitted patched round balls to bore dia. conicals (Parker Hale 451 Volunteer), offhand, bench and over the log matches
WMLRA competition and range officer
A good bit more than an amateur gunsmith and machinist
Built, rebuilt, refurbed and problem solved too much stuff to remember or list
Seen and been around a bunch of stuff done well and a whole lotta stuff done poorly or just plain wrong and figured out how to tell the difference
The specific model ML is still a rifled barrel that launches a projectile with a powder charge, the fundamentals are well established; any problem points toward the solution. In this case, the hard loading indicates too large a bullet or combination of bullet/sabot even though it may be what is factory recommended. The particular barrel is telling what is going on. A thou' or two too large can be a noticeable difference. Trying a smaller dia. projectile is the quickest and easiest trial. Not likely the bore is rough but it is worth a look with a good light/ popping the breech plug & inspecting and/or running a tight fitted oiled cleaning patch downbore to feel for roughness and/or snags. Polishing a good bore wont hurt but is cart before the horse to looking at what is there and finding a combo that runs in nicely.
Btw, if those '.452' bullets are cast but you havent actually measured them dont believe the box!
Last edited by gcrank1; 01-09-2018 at 11:32 AM.