....and with a fatter bullet?
Any real difference between the velocities achieved with a 200gr bullet in each caliber would be on the order of the differences between different barrels in the caliber.
I've shot a fairly diverse variety of bigger game animals (over a 35-year period) with the .350 RemMag but admit I've never even seen a rifle chambered in the .325WSM but I can read a loading manual.
Or do you have a different opinion?
