I am just starting to load .257 Roberts. I have used IMR 3031 and 4064 in .308win and do not like the extruded powders. Someone at work mentioned Ramshot Tac and so I tried it. I like the way it meters and burns clean. However, there are very few loads out there. Ramshot has load data for .257 Roberts using Big Game and Magnum but not Tac. Has anyone loaded with Tac? or what are some of your other "pet loads" I will be sticking with 100gr. Remington Core-loct bullets as I have a near endless supply.