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You will get the readings according to the book if you use a digital type caliper, and put the compartator on and push the caliper to zero then you will have true readings because when you put on the compartator on you lose some length you think but it really adds length just try to chamber one of those rounds you made it won't fit if you don't have digital mike then make one of you rounds the normal way and measure with out the compartator then once you have one made put on the compartator back on then measure it again then once you have that measurement leave it alone and repeat another round but NOW you have the measurement with the compartator.... I know it sounds trouble some but it is not once you got your measurement you will alway have it from this point on and can use the compartator for the same exact ogive measurement to the rifling....
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