I am beginning a hunt for brass cases able to be reloaded. I have found listings for all the above listed cartridges. It is my understanding that 7.62x54R and 7.62 Russian are the exact same cartridge. I also believe that I read that 7.62x53R is also the same, just given a different name by another european country other than Russia. Am I correct? If so, Midaway has Norma 7.62x54R for $72/100 and Lapua 7.62.53R for $48/100. Which should I get?