WHAT DOES IMR 7828 SSC POWDER IN STOCK MEAN?

GOOD LUCK and read more be delighted If you're able to load rounds that shoot a similar POI each and every time you pick it up with four shots without the need of performing some important figuring.50 yards to a hundred it's possible but bought my doubts as things change identical to powders. I love a ninety to 103 fill ratio but that is not supe