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Rifles, Reloading, Optics, Equipment
Reloading
7 RUM jump vs free bore
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<blockquote data-quote="coyotezapper" data-source="post: 1121951" data-attributes="member: 20438"><p>Factory Remington's can have as much as .400" freebore but I believe they do this for safety reasons. The 7RUM is very overbore and can be over pressured very easily during handloading. With a tighter chamber pressure can jump dramatically with as little as .5 of a grain of powder. The freebore helps alleviate the sudden over pressure and makes pressure signs more gradual like other cartridges. Don't let this scare you. I have a rem700 custom shop 7RUM that had this freebore and it shot great. I have since shot out the bbl and it has a chamber designed for the 180 Berger VLD with a .060" freebore now. If you think of it like a Weatherby chamber like the post above mentioned its like a pressure vessel and most Weatherby's shoot well.</p></blockquote><p></p>
[QUOTE="coyotezapper, post: 1121951, member: 20438"] Factory Remington's can have as much as .400" freebore but I believe they do this for safety reasons. The 7RUM is very overbore and can be over pressured very easily during handloading. With a tighter chamber pressure can jump dramatically with as little as .5 of a grain of powder. The freebore helps alleviate the sudden over pressure and makes pressure signs more gradual like other cartridges. Don't let this scare you. I have a rem700 custom shop 7RUM that had this freebore and it shot great. I have since shot out the bbl and it has a chamber designed for the 180 Berger VLD with a .060" freebore now. If you think of it like a Weatherby chamber like the post above mentioned its like a pressure vessel and most Weatherby's shoot well. [/QUOTE]
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Reloading
7 RUM jump vs free bore
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