I prefer to buy or, if necessary, make new brass and, if possible, get all of the cases from the same production lot.
I have a process that I follow that begins with having between 100 and 300 cases that are dedicated to a single rifle. Hunting rifles get 100 cases, while varmint rifles get 200 or 300 cases.
Since I have a dedicated set of brass for each rifle, I don't have any reason to use brass that has been used in a specific rifle in any other rifles.
Before anybody gets their panties in bunch, I'm NOT saying that this is the best way to do it, just that it is my way and since I've been doing it for better than 4 decades with good results I'm not likely to climb out of my comfortable rut.
