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The Basics, Starting Out
Measuring shoulder bump with coal vs shoulder comparator
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<blockquote data-quote="LaHunter" data-source="post: 2610075" data-attributes="member: 54963"><p>COAL = Cartridge Over All Length (case head to bullet tip). This is independent of 'brass shoulder bump' and really not directly related to shoulder bump.</p><p>As far as precision reloading goes, COAL is really only useful to ensure your rounds will fit into your magazine.</p><p></p><p>Shoulder bump is a key measurement of brass sizing. You will need to measure this with a comparator type tool that indexes on the brass shoulder. This measurement is important so that you minimize overworking the brass, while ensuring that your sized brass will fit into your chamber. Many reloaders like to have .002 - .003 of head space (clearance) with their sized brass to ensure they will chamber every time.</p></blockquote><p></p>
[QUOTE="LaHunter, post: 2610075, member: 54963"] COAL = Cartridge Over All Length (case head to bullet tip). This is independent of 'brass shoulder bump' and really not directly related to shoulder bump. As far as precision reloading goes, COAL is really only useful to ensure your rounds will fit into your magazine. Shoulder bump is a key measurement of brass sizing. You will need to measure this with a comparator type tool that indexes on the brass shoulder. This measurement is important so that you minimize overworking the brass, while ensuring that your sized brass will fit into your chamber. Many reloaders like to have .002 - .003 of head space (clearance) with their sized brass to ensure they will chamber every time. [/QUOTE]
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Measuring shoulder bump with coal vs shoulder comparator
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