Again...here are the three "hulls" found in the sniper nest. The only way the farthest hull could be where it is after ejection is if the rifle was perpendicullar to the window frame and ported at a near 45 degree angle butt up, any other angle and it would have hit the stacked boxes to the right. The first shot was fired when JFK was 85 to 90 feet from the window if you do triangullar math. Oswald changed his position and the rifles angle for the two hit shots, these spent hulls hit the boxes and came to rest below the window. Try this for yourself if you're a serious investigator, which most of you claim to be. Sherlock Homes and Arthur C. Doyle would trash you people in a court.
My Carcano ejects shells over a pattern about five feet wide. A lot depends on how vigorously you work the bolt. Nothing really solid here.
Sorry, it took me a bit to figure out what this was all about, since I was confused as to what a boat had to do with the JFK assassination. The term used is generally "cartridge", "shell" or "shell casing". And trust me, as an individual who has literally fired tens of thousands of rounds, shell casings can be really weird. I have fired hundreds from an M-60 fixed on a locked tripod, and when it came time to pick them up they covered an area of around 10 square meters. On an M-16 firing line, it is common to find them both 5 meters in front of the person firing, and 5 meters behind them as well. In firing in a pistol range, I have had 10 in a row from a .45 fly off to the side, then the 11th go almost straight up and hit me on the top of the head after bouncing off the overhead cover. And this was firing at a fixed target at a fixed distance. Not even tracking a moving target like Mr. Oswald was doing.