why wouldn't you just load bismuth shot and shoot the 10 ga as a 10 ga. i shoot an 1889 parker EH 2 frame at 8 3/4 lbs an a 1892 EH 10 on a 3 frame at 9 1/4 lbs 32 in F/F , i shoot 1 3/8 th oz bismuth BB's at geese and kills the dead at 65 yds, its murder on ducks with 1 3/8ths 4's, with the...