Jazzz.
I'm from a military family. Hence I know more than the average civilian does about weapons and their effect on the human body. Not everything, but enough to be certain in my own mind that Oswald fired the shots.
I'm a crime writer. I have, surprise surprise, some degree of knowledge of how assassins operate. And that includes the 'lone gunman' type like Oswald.
I've fired rifles with live rounds, having received tuition in shooting, gunshot wounds and the ballistics thereof, from a combat veteran of 21 years military service, which included some six years of warfare at the very least.
If you want to convince me then you'd have to do a lot better than three or four people I've never even heard of telling me something that goes against what the aforementioned combat veteran (and my own experience) taught me, I'm afraid.
On a side note, there is a certain irony in that a thread that originally started out noting that the number of conspiracy theories and their exponents seems to have risen in the internet age, has itself descended into yet another hoary old conspiracy thread.