Originally Posted by
Bullcamp82834
Light bullets with heavy powder charges accelerate forcing cone erosion. I can't explain exactly why but I learned all about it loading for a 357 mag many years ago.
I stick with heavy bullets in magnums. It works and that's good enough.
I believe a lighter bullet will leave the chamber faster allowing the unburnt powder to escape and burn as it is passing the force cone. Where as a heavier will move a little slower and allow most of the powder to burn in the cartridge. Just my 2cents.