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Rifles, Reloading, Optics, Equipment
Reloading
What is “powder bridging”?
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<blockquote data-quote="Lefty7mmstw" data-source="post: 1682553" data-attributes="member: 48043"><p>In actual use, you have a hard time finding a stick powder in sub/ 7mm bores that is suitable for the extreme overbore cartridges like the 6.5/ 270 rum or the Allen mags... Retumbo is already a bit fast burning in something like a 7rum (I was having pressure issues before I got to 90% fill).</p><p> Going more overbore and trying to use smaller kernel stick (that might actually flow under pressure down a 6.5 or 25 cal bore) just isn't going to happen (no one really makes the powder) so you either rick burn issues (possible gun damage/injury or at the least a poor performing load) from bridging or you put up with ball powder and sometimes having to adjust load/ velocity for temperature.</p><p>In my 7rum (and 7stw) I am lucky; I've never had bridging issues with a 7mm bore and 5010/ 50BMG or rl50 (rl50 DOES act happier in a 300rum pushing 225's). I'm probably on the edge of this happening though, with the 270AM having the problem.</p></blockquote><p></p>
[QUOTE="Lefty7mmstw, post: 1682553, member: 48043"] In actual use, you have a hard time finding a stick powder in sub/ 7mm bores that is suitable for the extreme overbore cartridges like the 6.5/ 270 rum or the Allen mags... Retumbo is already a bit fast burning in something like a 7rum (I was having pressure issues before I got to 90% fill). Going more overbore and trying to use smaller kernel stick (that might actually flow under pressure down a 6.5 or 25 cal bore) just isn't going to happen (no one really makes the powder) so you either rick burn issues (possible gun damage/injury or at the least a poor performing load) from bridging or you put up with ball powder and sometimes having to adjust load/ velocity for temperature. In my 7rum (and 7stw) I am lucky; I've never had bridging issues with a 7mm bore and 5010/ 50BMG or rl50 (rl50 DOES act happier in a 300rum pushing 225's). I'm probably on the edge of this happening though, with the 270AM having the problem. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
What is “powder bridging”?
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