I tested my 12 gauge Remington 870 Express with 3" 1 7/8 oz, 5 shot and my patterning was great at 10 paces and more then adequate at 20 but was starting to lack at 30 but I still had over 10 bb's in the vitals on the head/neck but only had 3 at 40. Should I call this good and just not take anything over 30yds or should I look for a different choke or different shell?