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Old April 23, 2018, 11:44 PM   #90
JohnKSa
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Join Date: February 12, 2001
Location: DFW Area
Posts: 21,801
Quote:
Let's start by using the proper terminology. Accuracy is hitting your intended target. Precision is the ability to hit the same place repeatedly.
The true technical definition of accuracy is that the statistical sample is unbiased with respect to the true value--that is, the average of the error of the sample set is zero with respect to the intended value.

So 'accuracy' isn't about "hitting the target" as much as it is about whether or not the group is centered on the target. A gun that spreads impacts into a group size of 3 feet at 10 yards is still perfectly accurate as long as the group is perfectly centered on the point of aim.

Using the technical definitions, any non-defective firearm with properly functioning adjustable sights can be made to be perfectly accurate by properly adjusting the sights. Barring fixed sighted guns or guns which need repairs, all guns are only a sight adjustment away from being perfectly accurate by the technical definition.

But all that is really neither here nor there as the technical definitions of those terms are not the accepted definitions in the field of firearms.

When people talk about firearm accuracy, they mean how small the groups are. When they talk about guns that don't center their groups on the target, they're not talking about inaccurate guns--they're just talking about guns that need their sights adjusted.

Perhaps, with a major concerted effort and a lot of time, it might be possible to win the firearm community over to using the technical definitions, but it seems to me that there are much better ways that level of effort could be expended.
Quote:
Basically, I am arguing that a gun that is properly mounted in a Ransom Rest that is properly secured, should yield the maximum degree of precision allowed by the combination of the gun and the ammunition.
Insuring the "maximum degree of precision allowed by the combination of the gun and the ammunition" doesn't guarantee accuracy or consistency or precision or whatever one chooses to call it. If the ammo or gun is the problem then there's nothing a machine rest can do to fix the problem.

If I take the best machine rest ever made, clamp a .40S&W pistol into it, perfectly following all the instructions for the rest, and load the pistol with 9mm ammo, then even the " maximum degree of precision allowed by the combination of the gun and the ammunition" is still going to be miserably inaccurate, imprecise, or whatever one chooses to call it.

The rest can eliminate shooter error. It can't do anything to fix problems with the gun/ammo combination. In other words, using a machine rest doesn't guarantee accuracy or consistency, it only eliminates shooter error.
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