right so you keep ONE factory round aside...set up your dies for length/seating depth with it...giving you same or VERY similar bullet jump you are half way there.... velocity will be somewhere between 3/4 and maximum...being a factory loading it wont be super hot and being federal shouldnt be too mild.... you could if you happend to know what powder was used in factory load pull a round and measure it.... or if had chronicgraph fire factory load and keep going with reload till find same velocity...... or just put a not too hot load together and go shoot something.
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