I'm not arguing or disagreeing.I'm just curious and interested in learning something.
Without modification,a 30-30 reamer would typically have a bore dia pilot,perhaps removeable/replaceable,then a leade/throat section appropriate to 30 cal,(too big for my understanding of the job) and a 30 cal neck section.
Its all ground on the 30-30 reamer. I understand a second neck/throat reamer,if you still have the barrel steel.
Did your brother grind/modify the 30-30 reamer,or have PTG or someone do something as a regrind???
I ground a 40-70 Sharps to my satisfaction out of another reamer once.
Used an index,a sine plate,a slotting saw arbor,and a cup grinding wheel on a Bridgeport! Fun.
Back to single shots. A doggone Ballard is a pretty rifle.Elegant. Go ahead, ask me if I'd rather have a Ballard..than a 40X.(assuming the Rem will beat .5 MOA,and the Ballard will go 2 MOA with cast bullets)