I have hand loads worked up for 150-gr j-word bullets using IMR-4895 in all 3 calibers, and I was surprised when all the powders listed in the Lyman #49 manual for my 170-gr 311291 CBs are faster on the burn rate charts than the 4895.
Can anybody who knows their internal ballistics explain to me why a heavier, slower boolit needs a faster powder? I predicted a slower powder...