Velocity, assuming you started measuring low, tells you much closer than anything else; what your Pressure is.
Grains don't mean much, as the lot variances are so large.

In the end, one of these loads is well over max grains listed, one is under. But the velocity matches the book data, as well as the Pressure.
[Linked Image]
[Linked Image]


I'm a firm believer in the theory of " If it bleeds, I can kill it".