"In my Lyman Mustang, with a 300 grain Hornady XTP bullet in a Harvester Crush Rib sabot,I get and average of around 1650fpswith 90 grains T7 FFG, and 1770fps with100 grains."

My experience with my .50 Encore using JSG and a 250 grain SST is:90 grains is very accurate; 100 grains is also very accurate. At 110 grains, accuracyis gone. The SST is a very tight fit in the bore of my gun but i live with it because of the accuracy.