I can't see no.7 penetrating more,nexceptcat extremely close ranges. Not disputing the comments or those tests.

I think I remember Police somewhere switched to smaller shot to. Avoid wall penetration. Perhaps no. 4s. I don't remember exactly.

If I needed close quarters defensive shot shells I'd use my fox loads in BBs.

If it was in woodland or open fields SSGx or SGs. Longer range effectiveness?

Of course the dhotshells down are for foxes, pigs etc.