If he fire forms 30-30s its shorter (about .1.90-1.95), then trim that back to whatever and make his own 'family of lengths'
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I have one trimmed to clear the base of a .379 soft lead bullet breech seated right up into the rifling that I can decap/recap, fill almost to the top at the bench and card or wax wad and stand there shooting schuetzen, old time style.
For hunting it isnt the powerhouse we have become used to, on either end, but I think it kills out of proportion to its size due to bullet dia. and that FP cast bullet. A little loopy in traj. but so is a 45-70. If we want a 'flat shooter' Im really thinking something like the 30-06 might catch on...........though that 30-30 is a 'fine, small bore express' (T. Roosevelt).
Im really happy with 100% loads of Trail Boss for cast shooting in my two. At 50yd. out back, if I do my part, its laying them one on top of another with just a casual rest across the deck rail. That with the cheap Lee mould bullet of soft lead or basically WWts for a little harder. My Express loads make it a real 150yd. hunter and Im typically not reaching that far with a peep/bead anymore anyway.