Sorry to hear that man,
I just called a friend of mine who hunts with someone who has 1 arm. This guy shoots a 12 Gauge Browning Gold Hunter...Very well.
I was very suprised by his answer because this guy is not very big.
I'm assuming this accident recently happend; so my advice would be to shoot a crack barrel 20 gauge for a while until your arm adjust to the extra workload.
This guy shot 12 doves last year with 14 shells, and my buddy saw him shoot a triple on ducks, so keep your spirits up you will be banging em soon enough.
Hope this helps, wish you luck.