I've seen just the opposite, from my experience...

It's best used though,as an extreme example rather than practice, in that we'd all likely agree that same brand brass is a given if some measure of consistancy is expected. Where the extreme of trying an OCW load in different brass becomes a good example is showing that thelesser differences in same brand/lot #brass become even less of a factor.

IOW, I'd hope we can agree that a huge difference in case capacity between brand X and brand Y is "not reallya good thing", but a smaller difference across a lot # of brand X,OR brand Y is even less of "not reallya good thing". For that reason, and with the example of "different brass", I've found that weighing cases in the same lot#is largely a waste of time, when an OCW load is involved......

I'm all for simplicity in obaining good results from a complicated system.....