At what range were you getting 80-90 in 10"? if it was at 40, my question would be Do you expect him to have to shoot 40 yrds, What did the 25 yrd pattern look like if it was even and had good coverage you should be fine, the RSF or one in the 570 range should shoot those shells well, with it being a non-ported choke it may shoot a flite control shell better