Thread: 300 Rum Brass Cases

Here is a link to a Brian Litz article which is good http://www.bergerbullets.com/wp-cont...13/03/COAL.pdf

Originally Posted by stug

Here is a link to a Brian Litz article which is good http://www.bergerbullets.com/wp-cont...13/03/COAL.pdf

Maybe it’s enough if you are approaching the extreme limits of pressures but if you run a "lab test" in Quickload by changing the COAL it makes bugger all difference apart from cases where the bore is large compared to case capacity, I.E. 30BR. In a case like the 300rum seating depth will have a very small impact on pressure due to the already huge case capacity and relatively small % change you are causing by seating the projectile deeper or not. Litz is right of course but he doesn’t quantify it with numbers to say how much and he doesn’t acknowledge the importance of relative bore size to case capacity. All in all buggered if I know why he is getting the results he is...

I would agree though that changing to a harder brass to stop getting pressure signs is not my idea of safe reloading practice, if you're pushing the envelope that hard you had better hope you have a good understanding of what your pressure is doing in different environmental conditions too...