Just got some 60gr. Sierra #1375 and wanted to try I4007SSC but, all my resources for load data don't show anything about this powder with a 60gr. bullet with the 22-250. Hodgdon shows it with 55gr. and 63gr. but, not with the 60gr. bullet. I wonder why this is? I'm thinking this would be a good powder considering its in between H380 and H414 for burn speed. Would I be safe using the starting and max powder charges for the 63gr. bullet? In my mind I would be but, not 100% sure! Thanks for the help!
Mike
Mike