So, I have an older STI Edge 40S&W (about 10 years old) with perhaps approaching 10k rounds through it. I'd like to sell it, make room in the safe and all that, but it suffers from an accuracy issue I've not been able to get to the bottom of. The pistol is reliable and appears to lock up/head space correctly but groups at 30 yards are less than impressive. Shooting 200gr plated bullets (0.40", 170PF) I'll see 8" with fliers out to 12". Shooting 165gr plated projectiles (0.40", 170PF) sees the group shrink to 5" or so. The coated lead projectiles I normally shoot were awful, some not even connecting with the IPSC classic target (30 yards). I thinking the bore of the barrel may be the issue rather than the barrel fitment given the way groups vary with projectile type? If so, I guess the thing to do is fit another barrel. The current barrel slugs at 0.40...