I have always used for grouse and ptarmigan a 20 gauge with #7.5 or #8 size steel shot. I got a case of #7.5 steel shells that has lasted me for quite awhile, however I am down to my last box. I have been having a hard time finding #7.5 or #8 steel shot in 20 gauge around Anchorage. The smallest I have been able to find is size 6 shot steel shot in 20ga. I have never used #6 for grouse and ptarmigan before. Is #6 shot out of a 20 gauge over kill? Or does anyone know any place that would have #7.5 or #8 20 gauge shells?