I used 14-17grs of Alliant 2400 in my 303 and 308 and also with my .444Marlin .
The beauty with Alliant2400 is that it is not case sensitive and I have never found the need to use fillers in my 303, or 308 or even with 19 grs of 2400 in a 444m case with lots of room to play with.
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