Rule3 was just trying to help. If anyone was being negative it was me. I have always considered this a simple concept and one that my first reloading manual explained in a simple to understand way. To me anyway.
The heavier bullet builds pressure faster because it takes more energy to get it moving from a standstill. That build pressure faster, so for the same powder you must use less of it. With a slower powder than one used with the lighter bullet you build pressure more slowly, get the heavy bullet moving, then get more velocity because of the greater amount of energy in the larger charge, within pressure limits of course.
Run into a big beach ball and watch it jump away from you. Run into a big ball full of water and see who is affected more, you, or the ball? You just built up a lot of pressure upon collision, where with the ball of air, it moved away never letting the pressure build up.
That's the same reason slower powders can get more velocity with bullets, instead of running full speed into the ball, you ease up to it and steadily increases pressure until it gets it moving. That's a great exaggeration of course, but is the basic idea.
The heavier bullet builds pressure faster because it takes more energy to get it moving from a standstill. That build pressure faster, so for the same powder you must use less of it. With a slower powder than one used with the lighter bullet you build pressure more slowly, get the heavy bullet moving, then get more velocity because of the greater amount of energy in the larger charge, within pressure limits of course.
Run into a big beach ball and watch it jump away from you. Run into a big ball full of water and see who is affected more, you, or the ball? You just built up a lot of pressure upon collision, where with the ball of air, it moved away never letting the pressure build up.
That's the same reason slower powders can get more velocity with bullets, instead of running full speed into the ball, you ease up to it and steadily increases pressure until it gets it moving. That's a great exaggeration of course, but is the basic idea.