Never did like the way those "piloted" drills were ground!  When possible, I like to use a boring bar in the breech end of the barrel to the dia. of the liner and about 1/2" past the chamber, then a good quality, sharp, twist drill with an extension held in a boring bar holder to drill through to the muzzle.  Lots of cutting oil...it's cheaper than a broken drill!  I've done it with a hand drill per the B instructions, and was not impressed.   

David
Montezuma, IA

Recently had a TJ liner installed in a Stevens 44. Pricy but I think the best. That being said, I have a Redmans liner from Brownell's in a Stevens Tip Up and a Crack Shot #26 and find the accuracy more than adequate for casual plinking and target work. Depends on what you want to spend and what your expecations are. With the problems you are having a liner sounds like the best way to make it right. I can get the cheaper liners done here in southern Illinois for around $120. The TJ cost me $260 installed.