I'm planning to load up some Nosler Spitzer Accubonds for my .338. In looking through my nosler book I saw a powder listed as H4831sc. According to my book "The ABC's of Reloading" it shows the sc as meaning short cut and indicates it is the same powder as H4831, just cut shorter to allow better flow through the powder drop. So I assume I can use H4831 to the same grains as the short cut and have the same safe load. Make sense? I'm just planning to load some various powders for pressure checks first.
Secondly, my 338 is at the gunsmith having the barrel cut from 26 inches to 23 inches. I'm thinking I will need to compensate the shorter barrel with faster burning powders. But how do I tell what powders are faster burning? Can I read that from the powder number? Do l look for powders that produce similar velocities with less quantity of powder? Any ideas?