does any body know if you can fire factory loaded parvi partizan ammo in a k31so you can fire form the brass . or do you have to size the new brass with k31 dies first ,i know there is a chamber size difference between regular 7.5x55 like in a swiss 1911 and the k31 .but i just dont know about the loaded parvi partizan they just started selling . i know grafs is selling it as loaded ammo and just boxer brass