Hi Travis,
I have never hand loaded for the .410
Are you asking if shooting a thick brass or steel shell will sort of "add" to the chamber wall thickness?
Not being a metalurgist, nor able to spell the word,I couldn't say.
But I would think that to truly have any affect of strengthening the chamber wall, the cartridge would have to fit so tight in the chamber , that extraction might be impossible.Or perhaps not.
I would also be interested in the answers of those that know...perhaps Rocketman will reply.Or 2piper.
cheers
franc
Interesting Q Travis