I have barrels from Kreiger Lilja Shilan all are good shooters there are more barrel makers just pick one of the premium barrel makers. You will get about 25 FPS pre inch. I would go with at lest 30 for Long range Hunting. How for do you intend to shoot? Crow Mag
Odds are if you go with a longer barrel, with a heavier taper you are going to have to open up the barrel channel for that stock. You want to be sure you get a heavy enough barrel that isn't going to whip when shot. The LSS stock barrel channel is not that wide.