6mm/250,
Curious as to what 22lr ammo you used?
Doc
CCI Standard Velocity. I have had good results in a variety of 22s with that ammo. It is my "go to" ammo.
Years ago I used Remington Subsonic but I quit it after getting a bunch of misfires , maybe Remington has corrected that problem by now I don't know. I try to stay away from any Remington 22 ammo now.
I also tried some Winchester 333 bulk pack ammo in this rifle but I had poor accuracy , a misfire and a failure to extract so I will look to something else if I want to shoot a high velocity load in this rifle.
Mike