A pile (most?) manufacturers of lots of stuff use one published weight to describe all configurations of a product. Example, apparel and footwear they pick a size and publish a weight for that size…guess what, if you get an xl and they published a weight for an M, your jacket might weigh almost double the published weight. Also, most weights are arrived at pre-production, and the product often isnt 100% complete when the catalog and copy have to be finalized, so minor changes to spec, molds, etc can change weight. In the case of a rifle, different calibers require a different chamber length, different action lengths, magazine boxes, and possibly even slightly different barrel contours for different calibers, are all going to change weight. The actual production stock might use a different weight of fill, and if it’s a wood stock there is natural variability in density and weight of wood. In a perfect world changes would get corrected over time, but that often is not the case.
Best bet, take any manufacturers published weight with a grain of salt.
