chokes arnt really an issue, iv tried all of my 5 chokes and i cant see a difference. pattern testing is a good idea, find a good cartridge and stick with it. saying that, iv shot pigeons, crows, rabbits etc with all kinds of cartridges from 5s right through to 9s. in my opinion its all about putting the shot in the right place
ps im not trying to be an expert its just what as worked for me!!!!!!!!