“n practical terms there is absolutely no reason to weight-sort cases as a precision-improving step. These tests include cartridge cases of the same brand that have been prepared identically, but with weights varying by up to 10 percent. That’s an absolutely huge variance that should eliminate the possibility of loading ammunition that will deliver a high level of precision and an extremely low level of velocity deviation according to conventional wisdom. Many handloaders sort brass into groups according to less than 1% [one percent] weight variation. However, according to the results of my most complete testing on this subject, measured in an indoor tunnel with an Oehler Professional ballistics system, there is no discernible difference in precision, point of impact, or velocity deviation with cases having up to 10 percent variation in weight. These tests were conducted with a shoulder-fired rifle chambered in .260 Remington that was supported by a Harris bipod in the front with a bean-bag rest under the stock. Accuracy with all groups averaged 0.4 MOA and the standard deviation of the velocity of all the 50 rounds used for testing was 4 feet per second. [M]atch results for benchrest events are recorded to the fourth decimal (0.0001)! Again, PRS [Precision Rifle Series, a tactical shooting event] and other practical rifle matches are a very different game. Without a doubt, the two most important factors that have cost me match points over the years are wind and unstable shooting positions.” -- Kyle Lynch. “Raise Your Modern Precision Rifle Skills.” The Complete Book of Reloading, 2017. pp. 72-73.
Weight sorting rifle brass
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