I have been firing 1,1/4 OZ Lightfield Hybrid sabot EXP slugs from an Ithaca Deerslayer II. (20" rifled barrel) In inches, what is the common difference between groups fired with a clean barrell vs. a dirty barrel? (with appx 15 slugs already through it)
I know that rifles have a slight difference in groups, so does a slug barrel show more of a difference?
I grouped the Ithaca with a dirty barrel. I cleaned the barrel and fired a fouling shot. The shot went 5" high , but still zeroed on windage. Is this the normal?