Not necessarily does it slow the lighter projectile down, but it's at least equivlent to taking 50lbs off the heavier one, thus making them more equal, but that may be too hard to understand, so if you're comfy at 800lbs, who am I to doubt it, but, it does remain the ONLY control you have over a "balance", you cannot control Hp, or how good or bad a driver or his equipment is, but you can at least control what "balance" you have over the field, as to what a starting point is. It really doesn't matter to me, according to your "guestimate", my car and driver should be right on the money! I just watched a video, of the world's fastest production automobile, and to pick up 5mph, it took another 120Hp. Bob!