Quote Originally Posted by Danny View Post
More like the grain (a unit of measuring weight) effects speed and thus trajectory (heavier the slower). The idea mugen is conveying is consistency. Use the same bullet weight for practice and defense. Just helps eliminate unneeded inconsistencies between shooting for fun and shooting to help save a life. Every little advantage you can get may help.

Also, i wouldn't worry about dirty shooting ammo. I like GA Arms "canned heat" for practice. Run what runs, avoid what doesn't.
Thanks Danny,

To make it simple, the factory ammunition labeled "180grn" will have a projectile at that weight. not the powder. with training and practice you can actually feel the recoil and distinguish the difference between 180grn and 165grn.