Originally Posted by overbore
May produce up to about 27% greater pressure than mild long range primers!!. I was taught, long years ago, "use magnums with 4831 and slower powders" but I agree that low temperatures and 4350 may require them. If we link the slow powder types to magnums, we then automatically cover the large capacity cases but I strongly disagree with their use on ball powders. Overbore
I don't understand why you 'strongly disagree' with using magnum primers with ball powders.
My understanding of their make-up is that to change their burning rate,they are either made flatter,which increases the surface area,so they burn slower,or they are made smaller,which reduces their surface area,so they burn faster.
The other factor they use to alter burning rates is the amount of deterrent coating they add to get the correct amount of burn rate.
This significantly makes these powders harder to ignite than 'normal' stick or flake powders.
Every ballistician I have spoken to says that a magnum primer with these powders is to be used,regardless of case size.
If I am incorrect in these facts please show me some evidence to the contrary.