My own M18 is a 7mm Remington Magnum, which shoots very well with a wide variety of bullets from 120-195 grains.

In my experience the 7mm RM is a fine cartridge for a variety of world-wide game, from 100-1500 pounds. But so are a bunch of others.

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck