I don't know about Jim
but Bill's was a Goodling 30x47 with enough freebore that he shot 10X either 125 or 127gr(can't remember) bullets made with 1.080" jackets. They were sleek, 9 or 10 ogive.
to use heavy bullets? Jim Goody had a run with his Jag, which is a long cased 30 and Bill Sargent use to shoot a 30-47 I believe. I have never seen what could be gained unless it's to shoot heavier bullets fast.
Pete
but Bill's was a Goodling 30x47 with enough freebore that he shot 10X either 125 or 127gr(can't remember) bullets made with 1.080" jackets. They were sleek, 9 or 10 ogive.