What would make you think the barrel quality is queationable?
I would have to agree. Traditions is a good brand and should digest 150 grain with no problems. for the muzzleloader I use a Traditional Tompson Center for my hunting. Being a older one I know it will digest more then the new model loaders.Sig, It suprises me ,but I think you have been hoodwinked. Traditions is a very well respected name in muzzleloaders. The shop where I frequent has sold dozens, with no returns or complaints.
You should know better than to believe gun quality rumors without running by the forum.