Peck Peck A peck is an imperial and United States customary unit of dry volume, equivalent to 2 dry gallons or 8 dry quarts or 16 dry pints (9.09 (UK) or 8.81 (US) liters). Two pecks make a kenning (obsolete), and four pecks make a bushel. Although the peck is no longer widely used, some produce, such as apples, is still often sold by the peck. Despite being referenced in the well-known Peter Piper tongue twister, pickled peppers are so rarely sold by the peck that any association between pickled peppers and the peck unit of measurement is considered humorous in
Imperial units firearms and ammunition. Imperial measures are still used in the description of cartridge types, even when the cartridge is of relatively recent invention (e.g., .204 Ruger, .17 HMR, where the calibre is expressed in decimal fractions of an inch). However, ammunition that is already classified in metric is still kept metric (e.g., 9×19mm). In the manufacture of ammunition, bullet and powder weights are expressed in terms of grains for both metric and imperial cartridges. As in most of the western world, air navigation is based on "nautical" units, e.g., the nautical mile, which is neither imperial nor metric, though altitude