Most effective 12 gauge load for bear defense

[karolko]

Last week i asked about people's opinions on a S&W 500 for bear defense.

Unfortunetly i will be heading into the bush faster than originally anticipated, therefore i will unable to purchase a revolver and become comfortable enough with it before i leave. Thus i have decided that i will be lugging a round a 12 gauge pump in the field.

I was wondering if you boys could give me your opinions on what would be the best shot load to use for bear defense? And obviously where could i get some as well.

Thanks guys, looking forward to the answers.

Adrian Karolko