I bought a .17 Rem at a auction years ago it was a custom gun the action is a Sako the barrel had a persons name stamped on it was told it was a gunsmith in the army but anyway the gun was ugly but shot like a dream at 100yds the hole would just get a little larger most impressive thing I had ever seen with factory ammo decided to have the gun finished to make it look better. What a mistake that was now 3" groups at best is it possible that the custom dip of the barrel could cause this, the stock was redone also but the free floating has not changed re sanded inside to be sure.