I was very disappointed with the Superior Heavy in .22 until I remove the choke, lapped and polished the bore. It is now Steller, but only with my custom NOE cc1 mold. I say custom as it did not shoot well in the Heavy until I moved the center of gravity rearward in the slug by HP'ing. It is now a laser with that slug.
I would love to try a Slug liner "A" next.
the most important thin I have found with the FX liner is not to size the slug more than .0003 over groove. or most barrels for that matter. I tested slugs at .0007 over and they were markedly less accurate. So much for shoot precision our to the box. Always slug your barrel and size any slug to the barrel. Not just what any give vendor offers.
If you are really wanting top precision accuracy, the slug has to perfectly match the bore/groove and leade. Period!
this goes for any brand barrel. PB barrels are in general an easier start as they are designed for slugs form the get go. Just the twist has to match the length of the slug. TJ's is a great go to for this. Their pb liners are a perfect match.
My TJ's barreled Talon/Dor will shoot within 3/8" at 80 yards all day long with the 84 gran slug at 170+ fpe. Sadly, I lost most of my pics in a computer crash. GRRRRR!!!
Pic of the mold and before and after choke removal and hp'ing the slugs.
Before it was a fine shotgun. LOL
Pic #1 shotgun. Pic #2 Choke removed. Pic #3, Mold hp's for weight bias. First two pic's at 40 or 50 yards. Last pic, 80 yards. One shot to settle the reg., and 10 on target. Seems accurate to me. LOL ;<) But NOT out of the Box. Cherry picked? Yep, but not uncommon at all.
Knifemaker