I just started weighing my brass, just to see what would happen. I was a bit disappointed that the brass (Winchester) only varied +/- 0.75 grains, with one or two outliers in the bag. I'm not sure that tight a spread is worth weighing/separating, but why not? The summer is long and hot, and my bench is in air conditioned space.
NRA Life Member
Safari Club Life Member
I weight at least 30 once fired cases for each lot of brass I use in order to measure internal volume and enter the average volume represented by grains of H2O in Quickload. I've done this for hundreds of cases of different brands and calibers. Every time I do this I enter the data in an Excel spreadsheet and compare weights and internal volumes. I select the brass on the basis of 1% (+ or - 0.5% from the mean) variation of internal volume. My data shows that the correlation between weight and internal volume is valid less than 50% of the time. With Lapua brass the correlation is valid about 48% of the time. With Winchester brass it's less than 30%.
In my initial sampling of 30 cases, if I find 1 case with a variance of more than + or - 0.5%, I measure the internal volume of all the cases in the lot and weed out those that exceed the tolerance level. In my 338 Edge I've had Remington cases that vary as much as 10 grs and yet had practically the same internal volume. On the other hand I've had cases with similar weight where some where rejected for exceeding the internal volume tolerance.
I weight cases because I have to in order to measure internal volume. However, I'm absolutely convinced that selecting cases on the basis of weight alone is an absolute waste of time. In fact, to the extent that cases are selected by weight that should be rejected for exceeding internal volume tolerances, that practice is a potential source of vertical dispersion in long range shooting.
Read Froggy's comments on weighing brass; located below the pic of the loading bench. I don't know the range context he is speaking of, of course. For ultra long-ranges, I would most likely weigh brass and see if it provided better accuracy than non-weighed brass. I don't shoot at 1200 yard ranges, however, so we are comparing apples to oranges. For my shooting purposes, let me say that I don't weigh brass and have had no problems hitting small varmints with reasonably good accuracy.