I've been using a .410 for a couple years now on some hunts,I use it exclusively on westside birds and preserve hunts.I would however advise to make a plug for the 12.I shoot clays every weekend during the spring and summer with the .410.My other hunting gun is a 20 gauge O/U choked IC and Mod.
No matter the gauge or the choke one must remember the basics....................Butt,Belly,Beak,Bang and if a crossing shot is made,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,follow through and swing smooth.