Serious answer: I am not a hunter of small furry or feathered things, but the bloke who initially taught me about shotgunning said to always pattern test. He practically demonstrated that even the same numbered cartridges from different manufacturers produce vastly differing results out of one gun - even different guns of the same model produce different results, would not have believed it if it had not been demo'ed. Best advice, decide what you are after and then try cartridges to find the best to suit your gun and the particular game you are after. Go buy some 6 & 7 from two or three different ammo makers and fire those at some static targets at hunting range.
I personally use 7 for training, 00 loaded for a couple of warning shots and then everything after that is slug...........but, thats h'Amerika.
I was thinking more of some stuff I got called NSI 'OK' carts. At a time when I was firing about 400 carts a week, I fired 80 of those and could barely move my right arm for three days. Inability to **** is bad enough, but inability to shoot is intolerable.
Honestly folks if you can consistently dust clays then it should be ok for most game, I usually shoot under an ounce wherever possible as I am usually a walking gun and blasting them all as close to me as I can get away with. I find that provided it goes bang and connects I'm not too fussy although felt wads all the way and have been for a long time on shoots and clay layouts down here for a long time!