Cornershooting is pretty much a staple tactic of early-midgame no matter what build and doing so with a decent amount of proficiency is why I always go for hell's arena on a non-AoB game. Which is why I struggle so much with the chained courts in comparison ;_;
I don't believe that I had a combat shotgun at that point, or I would have had that in my prepared slot for use in other situations. I also didn't see the 2.5 second reloading time, and in theory that sounds like a bad idea. However, even with hell knights I had no trouble corner shooting with it - the extra damage does a LOT of knockback and kills a lot faster. It also pretty much guarantees a kill on lesser enemies at edge of LOS. In situations where the elephant gun wasn't enough I did have the double shotty to fall back on, so I didn't really have too much trouble.
I can see where you're coming from and i'll keep it in mind before hastily assembling another one though.
The reason I was not taking reloader and shottyman was because I was doing a gunrunner build. Although, your post DID give me an idea.
As for not sucking on UV, 8 platinum and 1 diamond badge >_< I don't think I could even get one platinum badge, except for abusing AoOc with the 1000 one.