Re: Case % fill ?
It greatly depends on what chambering you are talking about, what bullet weights are used and what powder types you are using.
First off, The larger the chambering or should I say the larger the case capacity of a certian chambering, the more important load density seems to be as far as consistancy goes on average at least.
Also, if your using an easy to ignite stick powder, running lower end load densities generally will not cause huge velocity spreads.
If your using a large amount of ball powders which are harder to ignite, you will see more velocity spreads.
Lighter bullets also tend to be effected more by low load density as far as velocity spreads but again, this depends on the powders you are using.
Its good rule of thumb to look for at least 80% load density if your using stick powders and I like at least 90% for ball powders at minimum.
With the powder charge weight your using and the type of powder your using, I suspect you will not see a dramatic velocity spread.
Now if you were shooting a 275 STW with a 75% load density, you would see a much larger effect.
As far as H-4831SC, I would back off 5% and work up your load again, it seems to be a very bit faster burning then standard H-4831. I am sure simply because of the larger surface area of the smaller pieces of powder is the reason.
Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.
Farther, Faster and Flatter then ever before.
Web Page: www.apsrifles.com