As was stated, the only difference is the case. I came across a bunch of x54R for the mosin that is Silver bear, it shoots great, shoots clean, and performs as advertised. I shoot Brown Bear HP through my SKS, and it performs the same, reliable and fairly clean. I would put my trust in any of the Bear line of ammo, it has proved to be very good time after time for me. Wolf would be a close second to me (had a few FTF and FTL with it) BUY AS MUCH AS YOUR WALLET WILL LET YOU!!!