Try here:

http://tulammousa.com/products/non-corrosive-berdan-primers/non-corrosive-berdan-primers/

edit: I think the primers shown to fit the 7.62X 51 & 7.63x54 cartridges are the ones you want. They should measure .2563" even though their chart says otherwise.

Another good source of generic berdan primer information is:

http://www.dave-cushman.net/shot/berdan_supplies_dimensions.html

Last edited by tw; 09/02/11 11:42 AM. Reason: accuracy of information