In my BPS Invector Plus, I shoot an Indian Creek .675 w/ MagBlends and an IC .670 w/ Hevi-13 6's and 7's. Patterning w/ 3 1/2" TSS loads, a more open .680-.690 choke produced the most dense even patterns. I've found TSS in both 12 gauge 3 1/2" and 3" to be significant "overkill" at ethical ranges.