just buy 1 brand of brass,..and work up your load. the differences will show up in the use of mixed brass (different internal volumes and wall thickness). As long as you stick with 1 lot of brass,..you will be just fine. I tend to prefer win brass to the rem stuff lately,..it is just a bit better with respect to uniformity.

Brass quality makes a difference. The question is if you will be able to find the difference in YOUR gun. I have several factory rifles that get fed whatever is on the shelf of my local gun peddler. I have a couple with match barrels that get a diet of the high$ Lapua or Norma brass, and I *think * I can find a difference. Makes me feel better, anyway. On some, like my 223, I buy once fired brass (brassmanbrass), for even more savings.

But, don't buy your brass on Ebay. Support you local gun emporium, or mail order it from specialists like Grafs; Midsouth; Midway; Lock, stock and barrel; among others. HTH, Dutch.

The differance in brass is mostly hardness and the wall thickness and uniformity. Uniform walls make straight seating of bullets which improves accuracy. Hardness will have a effect on bullet/neck tension and longevity. Case capacity figures in to a smaller degree. I don`t worry about which brand I`m useing as long as I can seat my bullets with a minimum of run-out and brass life is good. If I was loading for bench rest or High poweer shooting I`d look for the highest quality I could get(Lapua, Norma) and sort, uniform pockets,ect. For hunting, at the shorter ranges I seem to hunt and every day paper punching I`ve been real happy with Winchester and if the price is right I buy Lapua.