This video describes various tools and techniques to measure the inside diameter of a smooth bore barrel or tube. First inexpensive tools are used then more expensive tools offering greater accuracy, precision and repeatability are investigated. Tools used include a scale, divider, caliper, telescoping gauge, micrometer, gauge block and finally a 3 point Mitutoyo hole gauge. Statistical methods are also introduced including average, coefficient of variation and Windsor trimming. Finally, the philosophy of real world measurement and its limitations is touched upon.
Less Lethal Ballistics
