20" CBI 1-9 twist on a stevens action
I have 50gr nosler ballistic tip varmint bullets ( #39522)
Winchester brass and IMR4198, Winchester small rifle primers.

Nosler shows 21gr as a max load, my load manual shows 22 (but with a different bullet-same weight)

What would be a good starting load (19gr?) and any idea how much jump these bullets like (coal is 2.8705)?