I want to work up a loaf for a Nosler Partion for my .243. For a 90 gr bullet the Nosler load dat shows both the IMR 4350 and IMR 4831 as good powders, with 43.5 grains of IMR 4831 as the most accurate load tested. But for the 95-100 chart neither IMR powder was even shown. Just curious as to why not?