I have a SX3 and SX2 with the same bore. I also pattern a bit with a Gold as well. The Star Dot is a great choke in all three with both hevi shot and lead. I really like the Star Dot and the Jellyhead .670 in those guns. Depending on the gun one slightly edges the other, but they are really close. I killed some toms with the SX3 SD combo last year with both lead and hevi loads.