I'd imagine that the helical cut on the rear of the wheel was calculated specificly for the calibre?

Currently the rifle it's on is just a display rifle, non firing. But I am planning on getting a firearms certificate when I can afford to. For the display rifle my father is a machinist so made the body mount and a new disk for my scope that I could have engraved. I'd figured that in the future I could have another disk made, take the setup to the range and mark the disk temporarily before taking it for engraving (the same as what was done with PPCO scopes basically) since I wasn't sure if the helical cut was different and wouldnt know how to caculate it.






Paul.