I have a tracker 2 H&R 3-4 Years ago I set out to make me a poormans 20 bore rifle out of it bought some hard cast slugs from Dixie slug and set out experimenting . I got to 2 1/2 - 4inch groups @ 50 yard at 1200 fps . Well my job (auto industry) went a way . I am now back to where I can play with this again . Dixie no longer sell the 20 gauge slugs. Your bullet design system show a bullet close to what I shoot .
So here are my questions and concerns :
Since this is just a toy I'm want to try to keep cost down some .
The cast slugs from dixie measure .625 dia. and can be pushed down the bore with out much effort engaging the rifling just enough to turn when hand pushing. Could a bullet @ .627 with your tolerance of a max of +.002 be shot as cast, and hand lubed ? Powder blow by is not a great concern because I use a plastic gas seal plus several nitro cards to build up colunm height.
No I have not slugged the bore but know plus .002-.004 still has plenty of clearance
I was loading loading bpi 3 "multi hulls plastic gas seal over powder 6-7 nitro cards over that 2 1/4 cork wads 2 1/4 felt wads and the slug setting on a nitro card and roll crimping