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Precision is a description of random errors, a measure of statistical variability.
Accuracy has two definitions:

More commonly, it is a description of systematic errors, a measure of statistical bias; low accuracy causes a difference between a result and a "true" value. ISO calls this trueness.
Alternatively, ISO defines accuracy as describing a combination of both types of observational error above (random and systematic), so high accuracy requires both high precision and high trueness.In simplest terms, given a set of data points from repeated measurements of the same quantity, the set can be said to be precise if the values are close to each other, while the set can be said to be accurate if their average is close to the true value of the quantity being measured. In the first, more common definition above, the two concepts are independent of each other, so a particular set of data can be said to be either accurate, or precise, or both, or neither.

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    More Accurate Story of Alamo?
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    Accurate Magpro in 270 Win & 7Mag

    Would appreciate any firsthand experience from members with this powder in these calibers. Some time ago I saw some guys claiming somewhere that Magpro is identical to the old Winchester Magnum Rifle (WMR) powder. That when Winchester discontinued it, Accurate picked it up and renamed it...
  3. ddjchemist

    What would you consider an accurate powder measurement?

    I decided to start my own reloading, so at this point I am reading and wathing various videos to learn as much as I can. I also got a couple of good books. I am planning on reloading 300 WM, 30-06 and 8mm Mauser. I still need to buy reloading equipment. I have one question about powder...
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