I have several Carcanos, but the one I like is the little carbine 6.5mm. I had to put a scope on it as the iron sights were calibrated for something like a 300 meter zero. I remember when I first tried shooting it, I couldn't figure out where the bullets were going. it turned out the bullets were all going high over the target. The 6.5mm round has a fair amount of bullet drop to it.

So anyway, LHO had to use the scope. I was at the Museum in Dallas a few years back and from where he was shooting from to where JFK was riding at, the iron sights would have been off by quite a bit. I still think luck had a lot to do with it though. Unfortunately, LHO was just plain lucky to pull it off.