Why bother debating how good the rifle was? In the only experiment of it's kind, the HSCA did an experiment where they roped off Dealey Plaza and fired shots from the TSBD and the Grassy Knoll while two observers reported where they perceived the shots coming from. The data says that a shot from the TSBD sounds like a shot from the TSBD and a shot from the Knoll sounds like a shot from the Knoll.
http://www.history-matters.com/archive/jfk/hsca/reportvols/vol8/html/HSCA_Vol8_0074b.htm
Since we have half of all Dealey Plaza witnesses screaming from the highest mountains they heard shots from the Knoll area, we can't just say it was confusion or something like that. It had to be an issue of acoustics.
It looks like there was either some activity from the Knoll area, or shooters from behind were using noise-suppressors in conjunction with supersonic ammunition. Noise-suppressors can create the illusion that a gunshot originated from the opposite direction that it truly did.
Diagram from a publication by the Military Armament Corporation about noise-suppressors:
[qimg]https://statick2k-5f2f.kxcdn.com/images/ctka/public/images/spattern.gif[/qimg]
The problem with that is that the vast majority of earwitnesses in Dealy Plaza only heard shots from one direction. If you're going to go with the minority of earwitnesses that heard only shots from the grassy knoll, are you now claiming that there were zero shots from the rear? You were arguing just a few pages ago that there was a rear entry wound in JFK's head, you just placed it lower than the authenticated photos and x-rays placed it. Are you now dismissing your previous claim?