I think that 5.3% is well within the range of experimental error. Consider that a Ransom Rest doesn't have any way of measuring movement, and the inserts that hold the gun are slightly soft. To measure movement requires setting up some sort of external Rube Goldberg apparatus to try to quantify how far up the gun flips in the Ransom rest. I doubt very much that three strings of five or seven shots each fired out of the same gun would register less than 5.3% difference.44 AMP said:A whole 5.3%?? wow!
Doubt I could notice that without test equipment, doesn't sound like something I would seriously concern myself about, I think.
I think that 5.3% is well within the range of experimental error. Consider that a Ransom Rest doesn't have any way of measuring movement, and the inserts that hold the gun are slightly soft. To measure movement requires setting up some sort of external Rube Goldberg apparatus to try to quantify how far up the gun flips in the Ransom rest. I doubt very much that three strings of five or seven shots each fired out of the same gun would register less than 5.3% difference.
Which is why the mass of the powder (while theoretically a factor in recoil) is usually ignored when calculating the recoil of pistol cartridges.
It is only ignored by simpletons. Ballisticians, Engineers, and those who know, include the powder mass within the term "ejecta" which is the sum of the powder and bullet, wad (if used) in many formulas. Other times it is broken out as a separate variable. It is not "theoretically" a factor, it IS a factor. Just because non math types ignore it does not move it from an actual variable needed for accurate calculation to "theoretical". It was proven, thus, not theory, long before any of us were alive.Which is why the mass of the powder (while theoretically a factor in recoil) is usually ignored when calculating the recoil of pistol cartridges.
A simple ruler doesn't work, because a Ransom rest doesn't move in a linear direction -- it rotates. Sure, you can use a protractor of some sort mounted beside the Ransom rest, but that requires making a precise visual alignment with something that's not part of the actual Ransom rest. That's why I said that 5.3% is within the margin of error for however you are attempting to measure the movement.74A95 said:Measuring movement with a RR looks pretty easy. Just measure how far the rocker arm/gun moves. A simple ruler works.
Argue all you want, the math says (with ALL factors taken into account) one is slightly less than the other, or its not, depending on how the numbers work out. (GIGO)
Whether it makes any difference to the person shooting, or what gets shot, is a different matter, I think.