Originally Posted by
Schuetzenman
Weighing a completed round of ammunition isn't going to be very revealing in most cases. AS you pointed out Mark, brass does vary in weight. How big a case is, brand / manufacturer, commercial or Military will all cause different amounts of variation. .223 military brass can vary upwards of 3 grains if I remember correctly. For match loads I will weigh the brass and separate them into different lots.
Benchrest shooters will fill the case with water and sort their cases by internal volume identified by weight of the water. Bigger volume cases will hold more water, lighter cases will hold less water and have a smaller internal volume. The volume inside the case contributes to pressure and bullet speed resulting from a known powder charge. Small volume = more pressure and speed. Bigger volume = lower pressure and speed.
Bookmarks