When I was about 14 or so, I had a single barerel 410 shotgun that I used to shoot with a case full of 3F BP and a 140 gr round lead ball seated on a grease wad.

From what I remember, it was a more powerful load than the 410 rifle slug that a friend used for hunting small deer in a swampy area in southern Louisiana. I think that those deer were not much bigger than 100#. They were shot at 50 yds or so.

That being said, I would think that 410 paradox with a proper bullet would be fun and, at short range, effective on small deer size game.