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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  1. J

    Super accurate 22 magnum??

    Does anyone have any suggestions for a super accurate 22 magnum rifle??
  2. conditor22

    Accurate 4064, 2495, 4350 recall (Nov 2019, powders made before 10/01/2016)

    Accurate 4064, 2495, 4350 recall (Nov 2019, powders made before 10/01/2016) Saw this on another Gun Board https://blog.westernpowders.com/2019/...recall-notice/ click on "Accurate reloading powder"
  3. benchmark

    10mm and Accurate #5

    New to reloading 10mm cartridge. Usually I use X-treme RN bullets for 45 acp. I was reading Western Powders load data and it does not have a listing for using copper plated round bullets (RN). Can I use that manufactures copper plated bullets? Can I use RN bullets. Where else could I find...
  4. N

    Signed Copies of "Unintended Consequences" available from Accurate Press

    This book was recommended in another thread here: https://www.northwestfirearms.com/threads/question-has-there-ever-been-a-realistic-study-of-how-many-would-be-killed-wounded-in-a-complete-u-s-gun-confiscation.308962/page-4#post-2354547 In trying to find the book, I discovered that many people...
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