I recently went to an estate sale and bought a big cabnet full of powders ,bullets,reloading books,presses and such for 150.00 was awsome deal. However in it I found powders I have never seen or used . 1st is sr-4756 I looked it up and I guess I could use it in my 45 according to load data . More research is needed . But my total inability to find data for (dupont 4531) is making me scratch my head . Powder is still good hate to throw it away but don't know what guns I can use it in . I have many rifles and calibers but am lost on this one. Any help would be appreciated. Thank you and thanks for allowing me to your forum. Mike hall