PRVI, Winchester, S&B, and Lapua are the main sources I'd look at. Well personally I wouldn't consider Lapua, too pricey for me to buy for a Mosin, but they're the only brand I can find locally that sells new brass. PRVI is the cheapest I can find in loaded ammo, but that in no way insinuates that it the worst. In fact S&B x54 ammo is the highest I find between Winchester, PRVI, and S&B, and has the worst accuracy in MY rifle. Winchester and PRVI shoot about 1MOA for me and I like PRVI brass better. Considering PRVI ammo is always cheaper around here (1/2 the price of Winchester), its what I buy to get brass.