i have a SBEII 26in barrel and cantget any pattern out of it besides fed 3in #4 ic choke or hevi steel #2 ic choke. 40 yards at sheet of newspaper with 30in circle. shoots low even with different shims. i have at least 20 different types of shells from win xpert, fed, blackcloud, hevi shot, hevi steel,win supreme, rem nitro, rem wing master and shot sizes form BBB down to 4. lead patterned with 10 bb's hitting the hole sheet of paper ic choke #5. what am I doing wrong been goning at this battle for a month now. patternmaster choke tube does not work. any insight please help