Today I was looking around in my bullet room and found some Bulgarian 762X54R. Its not the 10 over 50 or 10 over 55 it is 10 over 87 it has a lead core a 147 gr bullet and is in a 20 rd pack. Has anyone shot this stuff? And maybe know where or when I may have got it? I cant find a packing list. I dont have the cans it came in its all been repacked in 50 cal cans by me.