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well one thing I didn't add, and its not a cheap option
is there are custom muzzleloader bullet makers that have sabot slugs down to about .40 caliber, and they can be loaded lighter, get higher...

I am not possitive but I think the rule with straight walled calibers is the barrel must be under16 inches, making NO rifle legal , as rifle bbls are 18 inches plus

and that .410 should be all...

well seems to me it all worked just fine, and Congrats to you on a fine doe there
now for that big buck!