Sounds....messy.It's been a long time since I killed a deer with a shotgun but my last one was with a 20 gauge rifled slug at 60 yards. I took a neck shot and ended up cutting it's throat. :Note to self, never do that again.:
I haven't decided completely yet on what I'll be using but I am leaning heavily toward an 18.5" smooth bore with rifled slugs. I don't expect to have to take a shot much over 50m.I'd stick with slugs and I'd make sure of where my shots are hitting. Are you using a smoothbore or a rifled barrel? If it's not rifled what's the choke? Anything tighter than Modified is going to create problems with accuracy, which is relative with a smoothbore.