March 18th, 2017, 04:17 AM
Join Date: Apr 2015
Location: North Carolina
There a few other things.
Commercial propellants are blended to maintain some consistency Several lots of, say 4895, are mixed in varying proportions, so the energy output and burning characteristics match the "standard". So, while there are variations over the years, their general performance remains similar.
Hornady also is rather conservative in their recommendations, so the minor variation over the years do not result in dangerous conditions. If your expecting Hornady's data to give reliable velocities for charge weights, your going to be disappointed.
Last edited by lysander; March 18th, 2017 at 04:44 AM.