One link talks about a friggin pistol at 7 yards
How much does a cold bore affect a shot?
Several factors determine if the initial bullet you fire from a cold gun will follow your aim, but bore conditions is perhaps most important because cleaning solvent, oil, or fouling in a bore can act as a slight obstruction and cause a bullet to fly somewhere other than where you aim it.
www.outdoorlife.com
Bout 2 inches. Oswald missed his first shot by FEET. And he's no trained sniper. He shoots and the most powerful man in the world and misses by a mile...then executes two near perfect shots at a moving target?
Quite the lucky fellow
And ya know...Oswald didn't drive. So any "training he did had to be done via a bus ride...carrying a rifle. No record of such trips exist