Re: 5mm smc
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Does anyone buy the claim of less recoil and barrel heating? Could less recoil be achived by keeping more powder in the cartridge case and not sendng it down the barrel with the bullet? Is this why the short mag crowd clame less recoil? Kind of off this threads topic but I've always been curious.
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Recoil is a simple function of the law of action and re-action.
The momentum (weight x velocity) of the bullet, plus the weight times the "average" velocity of the gas after the bullet has left the muzzle (called the "jet effect") MUST be equal to the the momentum of the rifle (weight x velocity) in the opposite direction.
Since the weight of equal rifles is the same, and the weight of the powder is the same, if the velocity is the same, the recoil must be the same...
... the only way it could be less is if the gas velocity after bullet exit was less, and this could be less only if the pressure was less, but that can't happen, becasue the velocity of the bullet is determined by the average pressure, x the barrel length, less the friction.
Which means that if the same amount of powder is used with the same weight of bullet in identical guns (of identical weight and barrel length)... the recoil MUST be the same if the velocity is the same.
In in simple numbers, if the sum of bullet (and powder gas) weighs 1 pound and the sum of the velocities is 1000 feet per second... the the gun weigh 1000 pounds, it will recoil at 1 foot per second.
No one has EVER broken this law. When they do, they immediately get a Nobel prise in physics, and spend the rest of their lives earning billions on the lecture routes.
AS far as heating the barrel... the same thing applies - the heating of the barrel is due to the calorie transfer coefficient of the steel, times the average temperature of the gas, times the time in the barrel... plus the mechanical heating of the barrel caused by the physical motion of the bullet. For equal barrels, and equal velocities, these are equal.
These "theories" are the purest of BS.
In con games, it's called "Smoking the Rubes" (aka "Blind them with *********!")
It is a common tactic. Throw enough bad science at a non-scientific public, and they automatically believe it, because, well... "It sounds so scientific"
Here, kitty kitty kitty.
LRH member #23