Re: 6.5mm keyhole at 500 yds.
Not to sound like a conspiracy theorist here, but I watched a documentary on the History channel where they replicated the shot made on Kennedy with the same exact bullet, rifle, height of shot, and distance. It proves the banana effect and trajectory stabilization theory. Quite interesting if you get to see it.
"Enter through the narrow gate. For wide is the gate and broad is the road that leads to destruction, and many enter through it.  But small is the gate and narrow the road that leads to life, and only a few find it.
If you find your self in a fair fight, your tactics suck!- Marine 1st Sergeant Jim Ryfinger
Friends don't let friends develop canonitis!
arguing over the internet is like the special Olympics....even if you win, you are still...special!