.38-55 brass would be a mighty sloppy fit in a .410. Didn't look it up but as I recall the .38-55 would be around .05" loose in a .410 chamber
A former Co-Worker of mine told me once when he was a teenager he decided to "Make" a slug. He opened up a shell & poured out the shot, melted it & poured it back in. It only filled about half of the space the shot had occupied so he poured in the melted shot from a second shell. Fired it from a Stevens 311 & amazingly the gun held with no apparent damage, but he Said it sure Kicked Like a Mule, so he didn't try it again.
Also once heard of an ole Mountain man who used #5 shot for everything in a single barrel 12. For deer, he opened the crimp & poured in melted beeswax. He claimed it would punch a hole all the way through a good-sized tree. Seems it was common practice in his locale & they referred to it as "Waxing a Buck".
NOTA BENE; I do not recommend any of these methods.
