Not specific to models, more by cartridge. The numbers showed up in the '60s I believe. The #34 is usually seen on the .300, .250 and .22-250 and sometimes on .243. I tried to make a chart but there are crossovers. I have noticed front sight ramps vary in height so that affects which sight is actually used. I don't know how the guys assembling them kept it all straight and expect mistakes were made.
