I have a mossberg 835 ulti-mag with a briley .675 choke need some help on shell size,powder grams,shot size and brand name to get the best pattern.{ 10" circle at 40yds}.Right now am using Federal preimum 3 1/2" 2.0 gram #5's. Patterning around 20 to 22 pellets in the kill zone,about 110 to 115 pellets in a 10" circle.