I am going on a high volume dove hunt in Argentina. I have been told 20 gauges are preferred guns rather than 12's because of less felt recoil. According to a recoil table by Chuck Hawks there isn't much difference in recoil between a 1 oz load with either gauge. I am thinking a 12 gauge auto will have less kick than a 20 gauge because it has more mass. I realize that the 12 will be heavier to lift over a thousand times per day, but I am in pretty good shape. Does anyone have any recommendations?[/align]

Liveing Iowa I WOULDN'T KNOW, had to say that since we cant hunt doves here.
A freind has been to argentina a couple times, he got a Benelli Cordoba and really likes it. I would think any of the quality autos out there would be fine.

Benelli or Beretta and that's about it.

Beretta 391. 1oz of shot is 1oz of shot.

Also, stay with the 20 gauge. Your shoulder will thank you in the end.
Shooting 1000's of rounds during a Argentine dove hunt is much different than shooting 25 or 50 rounds a day during a hunt here.