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Old August 31, 2012, 01:09 AM   #5
Lost Sheep
Senior Member
Join Date: January 24, 2009
Location: Anchorage Alaska
Posts: 3,340
Sure about that?

Originally Posted by MarkDozier
slower burning powders build higher pressures.
Are you sure about that?

In one loading manual (Modern Reloading by Richard Lee), with the same 150 grain jacketed bullet, two powders both produce 34,000 psi, but the faster powder, Red Dot, produces 10% lower velocity (1155 fps) than the slower powder, Blue Dot (1285 fps).

I have always been of the opinion that powders of all speeds produce very close to the same pressures (commensurate with the strength of the firearms chambered for any given cartridge). Slower powders produce their pressure for a longer period of time than faster powders, which is how they yield higher velocities.

If anyone can tell me where I am wrong, I am eager to learn.


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