The 7x57 and 7x57R are the same cartridge dimensions except for the rim addition to the R. The non-+P pressures are the same for both cartridges. If you do not buy the Sellier ammo, you can make cases from 444 Marlin brass, but it cheaper and easier to buy the Sellier ammo.

You can use regular 7x57 dies to load your ammo, just use the appropriate shell holder.

Make the SHORT trip and bring the gun to Amarillo and we will shoot it and have great fun smile
Hope this helps
Mike

Last edited by skeettx; 05/01/13 10:43 AM.
USAF RET 1971-95 [Linked Image from jpgbox.com]