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Rifles, Reloading, Optics, Equipment
Reloading
High velocity
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<blockquote data-quote="lancetkenyon" data-source="post: 2312633" data-attributes="member: 68875"><p>7RM virgin brass has a way shorter headspace than fired brass. Meaning you use a lot of energy during the burn to form the brass. Usually something like (using a .420 headspace comparitor), virgin will be 2.107, and fired will be around 2.121".</p><p>Now, the 2nd firing, if you bumped shoulders back correctly, will be taking that wasted energy and putting it behind the bullet, instead of blowing out the case.</p><p>Also, if you now have 100+ rounds down the barrel, your barrel is breaking in, smoothing out, and speeding up.</p><p></p><p>Drop powder charge by about 1.5-2gr, and your velocity should come back down to the original speeds.</p></blockquote><p></p>
[QUOTE="lancetkenyon, post: 2312633, member: 68875"] 7RM virgin brass has a way shorter headspace than fired brass. Meaning you use a lot of energy during the burn to form the brass. Usually something like (using a .420 headspace comparitor), virgin will be 2.107, and fired will be around 2.121". Now, the 2nd firing, if you bumped shoulders back correctly, will be taking that wasted energy and putting it behind the bullet, instead of blowing out the case. Also, if you now have 100+ rounds down the barrel, your barrel is breaking in, smoothing out, and speeding up. Drop powder charge by about 1.5-2gr, and your velocity should come back down to the original speeds. [/QUOTE]
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High velocity
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