At ammo plants, generaly, once a production run of any particular ammo is started it all goes into a bin and from there it goes into a packaging process. The top of the bin is usualy packaged in the 50 rd boxes and the bottom of the bin is bulk packed., Mainly the bulk will show a lot more dings and nics on the bullets..the bottom rounds dropping further and being pummeled around more, otherwise there is no differance between say Fed individual box packed Blazer by the brick or Fed Blazer bulk pac sold at Walley. .............Plum