Hmmmm, over all length varies from rifle to rifle quite a bit. The distance from shoulder to rim varies less. You could make a fixture to measure the shoulder to rim length or you could cast the chamber to find out where the rifiling starts or you could try oversizing the neck slightly with a custom made spindle so that it opens the cartridge neck up slightly after sizing. Then you can shove a bullet that slips in the neck, chamber the round and measure the cartridge overall. I would probably use bluing on the bullet to make sure you hit the rifiling. This is a big deal in bench resting and I have heard lots of stories about how to do it. The distance from the bullet to the rifiling is a big deal for accuracy and lots of shooters play with that to improve accuracy. Most tell me the bullet should be no more than about 0.005" from the rifiling, less is better. One guy advocated making bullets the longest you could and still chamber them. Make the cartidge long, see if it fits, keep going until it doesn't and then back off a bit.
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