I like single 1745 or looped they last for ever never have any luck with flat bands , peoe say they get 500 plus shots with singles tapers but I never seem to hit 300 doing every thing right . However if I use flats I use single asda blue 30-20 dropped a few woodys no problem with 9.5
I use anything really , I use singles most of the time and shoot marbles , 9,5 steel and any other ball bearings , hex nuts what ever and double asda blue for 12 mm leads mate and the draw is easy