The manufacturers do what sells guns. The word "Magnum" sells guns, as do their advertized velocities. We've all seen the T/C commercial for the BDC reticle scope, quoting a 3 pellet load and 200 yd range. They're just doing what will sell more guns. That's how they make money.

I've never shot a ML over 100 yds at game. With my Genesis, and current 350 gr FPB over 100 gr loose pyrodex, I can shoot to 125-150 if need be, and that's all I need for my hunting. One day I'll try BH 209 but not to add range, I like the notion of easier cleanup.