i shot benchrest for a while myself and once in a while i could shoot bughole groups with a 6ppc.The first 5 shots for record at 100 yards.
The second target is a 10 shot group.
The third picture is a 5 shot group after cleaning and firing 2 foulers.
Not to bad if I say so my self. The first two groups were shot with some old scrap Frontier brass. I reduced the load to 42.grains and used Lapua brass on the last group.
All shot at 100 yards.
Nat Lambeth