Craig,
Sorry to burst your bubble, but like they say, "everything is relative".
There are no "poor shots" (by civilian standards) in the Marine Corps.
-- MWT
I don't think you need to worry about bursting anyone's bubble.
The Marine Corp considered LHO a "rather poor shot" shooting at stationary targets with a well maintained M1.
JFK was a moving target.
The Carcano was a worn, rusty WW11 military surplus rifle with a misaligned scope, sticky bolt and 2 stage hair trigger.