Re: H&R 20gauge slug selections
Not the same gun, but I was with a buddy last year when he sighted in his 20 gauge mossberg slug gun. In his case the group size was in direct correlation of the speed of the slug. The slower the better in his case.
The cheap slow lead sabots would go head to head with the best of center fire rifles in accuracy. One ragged hole at 50 yards. Shoot the fast (1800-2000fps), and it was all over the place. Didn't matter what brand in either case.
He just made a compromise with speed vs accuracy with his gun. I think the slugs he is shooting are in the 1700fps range, and there isn't a deer inside of 100 yards that's safe.
Venison - The other fast food