I've just got my grubby mitts on an 8x60 specially made for Clas A Heyer & Co Nairobi. It's a nice little rifle and looks to have some hunting left in her. Now on checking the proof marks for the bore diameter it's stamped 7,85.8,1.240 then under neath 8x60 with an S right angles lower down. Now I was expecting either 7,9 or 8,2 to say the.318 or .323 So what size bullets does she need????