Well,I mostly agree with whats been said, each gun is differentand I have have guns that wont shoot good with 77and that wont shot good wit Pyrodex so untill you know I suggest you keep both on hand to try with you loads the SSTwill shoot well out of most guns not all so you may end up changeing bullets, but most of the time you get the right sabot and the right load they will shoot if you told use what gun you are shooting or slug the bore we might be able to make some suggestionsas to what sabots to try. I find that to shoot really good groups often takes different sabots with different bullets in the same barrel. Also get some 30gr pellets a lot of guns that wont shoot good with 150 gr will with 130 or 120. [2x50-1x30] [4x30]
Lee