10-03-2014, 05:59 AM
I've figured out how to determine the rifling figures.
There are 25.4 mm in one inch. In the length of 21 mm, according to David Joseph's calculations, the rifling groove moved 2.5 mm of the circumference of the bullet.
2.5 mm divided by 21 mm x 25.4 mm = 3.023809 mm. This is the amount of the circumference of the bullet travelled in 25.4 mm or 1 inch.
If the bullet is 6.8 mm in diameter, 6.8 x 3.1416 (pi) = a bullet circumference of 21.36288 mm. We can also use the figure of 6.77 mm to be more accurate. 6.77 x 3.1416 = 21.268632 mm
If we divide 21.268632 by 3.023809, we get 7.033722, meaning that it will take 7 inches for the bullet to make one full rotation in the barrel. Translated further, it can be said that the rifle that fired CE 399 had a rifling twist of 1:7.
There is a problem with this, as I am unaware of any Carcano rifle ever manufactured with a rifling pitch of 1:7.
However, FBI SA Robert Frazier tells us he measured the diameter of CE 399 and found it to be 6.65 mm, not the 6.77 mm diameter many in the LN camp would have us believe. Let us try it with this number. 6.65 mm x 3.1416 = 20.89164 divided by 3.023809 = 6.9090474 or a 1:6.9 rate of twist. Uh oh, getting worse instead of better. Even rounding the diameter to 6.7 mm, which equals .264" (standard diameter of all 6.5mm rifle bullets except the Carcano), gives us a 1:7 twist (6.9609952), which makes no sense either.
What does this mean? Was CE 399 even fired from a Carcano rifle? Or is something else wrong here?
There are 25.4 mm in one inch. In the length of 21 mm, according to David Joseph's calculations, the rifling groove moved 2.5 mm of the circumference of the bullet.
2.5 mm divided by 21 mm x 25.4 mm = 3.023809 mm. This is the amount of the circumference of the bullet travelled in 25.4 mm or 1 inch.
If the bullet is 6.8 mm in diameter, 6.8 x 3.1416 (pi) = a bullet circumference of 21.36288 mm. We can also use the figure of 6.77 mm to be more accurate. 6.77 x 3.1416 = 21.268632 mm
If we divide 21.268632 by 3.023809, we get 7.033722, meaning that it will take 7 inches for the bullet to make one full rotation in the barrel. Translated further, it can be said that the rifle that fired CE 399 had a rifling twist of 1:7.
There is a problem with this, as I am unaware of any Carcano rifle ever manufactured with a rifling pitch of 1:7.
However, FBI SA Robert Frazier tells us he measured the diameter of CE 399 and found it to be 6.65 mm, not the 6.77 mm diameter many in the LN camp would have us believe. Let us try it with this number. 6.65 mm x 3.1416 = 20.89164 divided by 3.023809 = 6.9090474 or a 1:6.9 rate of twist. Uh oh, getting worse instead of better. Even rounding the diameter to 6.7 mm, which equals .264" (standard diameter of all 6.5mm rifle bullets except the Carcano), gives us a 1:7 twist (6.9609952), which makes no sense either.
What does this mean? Was CE 399 even fired from a Carcano rifle? Or is something else wrong here?
Mr. HILL. The right rear portion of his head was missing. It was lying in the rear seat of the car. His brain was exposed. There was blood and bits of brain all over the entire rear portion of the car. Mrs. Kennedy was completely covered with blood. There was so much blood you could not tell if there had been any other wound or not, except for the one large gaping wound in the right rear portion of the head.
Warren Commission testimony of Secret Service Agent Clinton J. Hill, 1964
Warren Commission testimony of Secret Service Agent Clinton J. Hill, 1964