About powders...thats a hard one.
Usually, faster powders are used in smaller cases, PPC, BR,etc. Single base extruded powders (IMR in particular) are easy to ignite compared to a double base ball powder. So most of the time, if a cartridge will show good pressure curves, it will with a single base extruded powder. Right up until it doesn't. I have never been able to get any powder in 300 Win mag to work as well as Ramshot Magnum. But a kinda rule of thumb, a faster powder will show a better curve. Most of the time. Usually. Until it doesn't.
