On Files' claimes regarding the weapon he said he used.

I've had some experience with the XP-100 in various calibers. The shooting position normally used with it in the matches I've done involves laying on your back, feet on the ground, knees raised and touching. The non firing hand is used to support the head, and the gun rests on the outside of the leg, on the calf muscle. The gun is fired with one hand. The .221 Fireball described on that site can be an accurate gun (but that plastic stock has to go). It's recoil is minimal, about the same a 9mm when fired in a single shot pistol. I know from personal experiece that a 7 year old with really scrawny arms can fire one well over 40 times in a day with no difficulties. It does NOT kick like a high powered rifle as one person suggested. If it were a .222, the recoil would have been more but still quite manageable for one hand. However...

Handguns can have scopes mounted to them, but these scopes have to have a very long eye relief. Nearly 2 feet in many cases. Because of this, nearly any movement of the relative eye/scope position will make the scope impossible to see through. Files implied he was standing when he fired. Nearly any recoil, even the small amount from this pistol will make the scope/eye angle shift enough to 'black out' the image. There is practically no way that he could have seen the bullet impact through the scope as he described it.

The claim that the spent 222 casing was part of the assassination and proves Files' story true doesn't hold up either. There is no reason to remove the case from the gun, which must be done manually unless the shooter needs to follow up. In this case, the shooter would need to fire the first shot, tip the over 90 to the left to operate the bolt (unless he's left handed). Raise the bolt handle and slide it back. Take the new round, presumably in the left hand and slide it into the chamber and close the bolt. The time to do this would be around 2 seconds for someone well practiced at it. But why do it at all? He said there would be no chance for a second shot. The XP is definately NOT a combat handgun. If he thought he might need to shoot his way out, dropping it in a breifacase and pulling out a more suitable gun would have made much more sense. There would have been no reason at all to eject the spent casing (leaving evidence of his position and involvement). Something someone of his claimed military background would have known.

BTW, I do see a reason for Oswald to have reloaded right after shooting Tippet. It was a combat handgun (sort of) and it was no longer fully loaded. With a revolver especially, you reload when you can, as often as you can.

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A Nerd can figure out how long it will take the original Enterprise traveling at warp 6.5 to travel from Regulus to Antares.
A Geek will think he can use that to pick up a girl in a bar.
A Dork knows he can't pick up the girl with it, but will hang around for hours anyway, just in case she asks.
She might. You never know.