I just bought 300 once fired Lake City 7.62 M80 machine gun brass cases, with 09, 11 and 13 dated cases. Weight sorting is the quick and dirty way to sort brass and I don't plan filling 300 cases with water.

But after reading below I'm going to use a two grain plus and minus limit. I'm 67, have chronologically gifted eyesight and drink too much coffee to go to anything more extreme for my new Savage Hog Hunter. And the 2 grain range is still half the variation of factory Remington and Winchester brass.

After buying two new bags of Winchester .308 brass of very poor quality that had six cases that were thrown in the trash, I bought the LC brass. It took time to prep and uniform the brass but when I finished I think the LC brass was much better than Winchester brass at a fraction of the cost. Plus the Lake City 7.62 cases are made heavy duty and are "Ford Truck Tough".


Match grade Lake City M118LR brass is selected from standard M80 case manufacture and must fall into a two grain weight range.

Case Weight Variation Reduction and Subsequent Ballistic Dispersion Improvements in M118LR
61.24% Of M80 Cases Fall In A Two Grain Range
https://www.google.com/url?sa=t&rct=...i2rT7uMi1mAz1A


Below they use one grain weight difference "BUT" many shooters just buy Lapua brass and do nothing to it.

Complete Precision Case Prep
Preparing Cases for Long-Range Accuracy
http://www.accurateshooter.com/techn...ion-case-prep/

Step 8

Weigh the cases and separate by lots not greater than one grain in weight difference or about 0.5 percent.

Below .223/5.56 case weight and weight variations, and as you can see the Lake City brass is "much" better than Remington or Winchester brass.



Also Nosler custom brass is weight sorted.