A.O., most reloaders agree H110/W296 is a hard to ignite ball powder that burns much better when aided by a magnum strength primer. I'm one of them and every time I do tests with standard and magnum primers the velocities stabilize and the SD numbers shrink with magnum primers over standard primers.

Years ago in most of the load manuals written before the testers got lazy would stipulate magnum primers when loading H110, W296, HS-7 and HS-6 because those powders should be used with magnum primers for the best results.

__________________
Freedom is never free!!
SWCA #3437