Oh, I fully understand and appreciate where you are coming from! And I probably should have said what I did with a little more thought and tact
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I kinda went that way for a LONG time when I was more into muzzleloaders, self sufficiency, 'Mother Earth News living', Buckskinning and historical re-enacting. It can be a virtuous life and BIG kudos to you.
But I ran out of steam and beans and did some re-evaluation of MY life and decided I did not have to 'do it all, alone', and some things make MY life, and utitize MY time a bit better. So far, no regrets.....
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To your end, if you use basically the muzzle loading smoothbore techniques in the reloadable cases (think of it as just a shorter 'barrel') you can get similar results. An old rule of thumb was equal parts BP to shot (by volume), though a bit less BP often makes for better patterns. If using smokeless, keep 'em low velocity and shoot game closer. Ive used newspaper to paper wasp nest as wadding, including soft green tree leaf in the field. Paper tube of various thickness may give you different patterns, and do try cutting those waxed thin cardboard (orange juice jug) X's to fold the legs up into neat little shotcups. Someone recently mentioned using those bio-degradable packing peanuts for wads, just squish 'em in to the height you need.
My guess is youve got a lifetime of exper'mentin' with it all, so go for it and have fun!
BTW, do you subscribe to 'Backwoodsman' magazine?, it sounds like just the thing for you.