D
dschliem
Guest
I have a 3 year old Border barrel on my Rem 37. My group sizes are a lot worse than when it was new. I'm lucky to hold a .500 group at 50 yards. The people who score my targeta say it looks like some shots are keyholeing. I have set the tuner to Eley Black box ammo. It seems to like it. My question is, what other things beside an oversized bore can cause this condition. If it is strictly the barrel I will replace it, but before I do I would like to know if anyone else had this condition and cured it without replaceing the barrel. I thank you all for any feed back you can tell me.....Slim