I play 5 stand (or a similar game called crazy quail) about once a month.
I buy Winchester Super Target, 1oz, 8 shot, 1180FPS when I see it. It's some of the softest recoil I can get with my 1301T.
It is significantly better than the Fiocchi loads I've tried. I had a box of Fiocchi stuff that was 1 1/8oz, 8 shot, 1200FPS for a game last week. (Used an 1187. New feild had barrel length restrictions). It was alot harsher despite a small increase in velocity to account for the extra weight.
I basically go with 1oz, lowest velocity I can get most of the time. Shot size is more or less unimportant to me.