Making a barrel too slick will open up your groups.
Even a dry barrel which is too slick will do it.
It can drive you nuts!
IMHA .0010 patch and a .490 RB sounds a little loose.
But, I'm mainly a paper puncher and I load tight.
BTW What twist is used in your barrel?
All my rifle shooting was done with barrels with a 1:66. I think I had one that used 1:72
« Back to index