I have had 2 different Black Diamonds and 1 Encore, all with QLA's bored off center from .009 to .015. The worst Black Diamond would not shoot any projectile accurately so it was returned to T/C for evaluation.

They replaced the barrel and receiver (one piece) and test fired it with 2 pyrodex pellets and 250 gr shockwaves and explained how they had only used their #13 bore cleaner in the barrel to clean it with. When I received the gun in the mail it was already rusting.

After a complete cleaning I tested the gun and it was indeed accurate with 250 shockwaves but not with powerbelts or bore size conicals. The QLA in this gun was off by .010 and I sold it to someone who only cared about shooting sabots.

My Encores QLA was off by .009 but would do a respectable job with sabots. With powerbelts and boresize conicals it was impossible to consistantly hit a washtub at 100 yds.

After having the Encore's QLA removed and the barrel recrowned it is accurate with any bullet I've tried including conicals and sabots.

I think T/C makes a good gunbut the QLA issue is real. Read this, http://www.prbullet.com/crown.htm

T/C's advertising is misleading and the DVD that came with the encore said you only need to remove the breechplug once a season to clean it. Also the barrel seasoning voodoo with borebutter isquestionable