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A lot of it is in brass prep, do you neck turn the brass ? you need to, trim them all to the same length ? do that also, clean and prep primer pockets inside and out, neck size only (only need about .001 neck tension) clean the inside of the neck when you are done with the above, some guys polish the inside of the necks with steel wool, I clean with carb cleaner and toilet paper.
If you go to a little more extreme you can weigh the brass, of course use the same manufacture for all the brass.
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USMC Scout Sniper 88-94
Instructor 1st. Mar. Div. SS school 91-94
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