A f friend of mine gave a flat of Win. 9 shot 12 gq. 1180 vol. that he got by mistake he ordered 6 shot nd got 9. I shoot 7 .5 & 8 . with my Rem, 1187 with a 28" barrel using a IM choke my question is what choke should I use with the 9 shot . would it be like shooting dirt at the birds.