Looking for your recommendations for what ammo to use. Lightfields are out, since going to the low brass the ammo does not perform or group as well out of my gun. Need other choices, have heard Remington copper solids and Hornady SST so far. Any more?

I shoot a gold and found coppersolids performs the best out of it. 2.75". I can't get the 3" to shoot at all. Second is lightfield. Third, I had good luck with winchester partitions. None of the superfast slugs work for me. I have tried the corelok, and few others and seem to get fliers.

lightfields worked best in my sx2.

Your fully rifled barrel will perform best with a Sabot. The lightfields noted above are great performers. I use Federal 1 1/8 oz sabots. I have also tried those Winchester copper sabots that boost 1900 feet per second, but they hurt too much, way overloaded.