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Long Range Hunting & Shooting
A head scratcher
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<blockquote data-quote="trueblue" data-source="post: 404132" data-attributes="member: 10654"><p>Freebird,</p><p>What weight are you loaded at with the Bergers on the lands?</p><p>It seems you are over pressure.</p><p>How I approached load developement is I first find my pressure point with the bullets seated on the lands, then work from there .</p><p>Go back to square one and load up some cases in half grain increments until you know where you start experiencing pressure signs.</p><p>I look for ejection marks, stiff bolt, measure the base of the brass for expansion no greater than .004, ect.</p><p>Then back off from that point and fine tune your accuracy with seating depth.</p><p>Retumbo and H1000 are both good powders for the RUM.</p><p>Also, when you resize your fired brass, take a piece that is chambering kind of stiff due to headspace. Run your sizing die down in your press to where it just bumps the shoulder enough to chamber that round easier. At that point you have bumped the shoulder. I would not use the brass you have that you described earlier .</p></blockquote><p></p>
[QUOTE="trueblue, post: 404132, member: 10654"] Freebird, What weight are you loaded at with the Bergers on the lands? It seems you are over pressure. How I approached load developement is I first find my pressure point with the bullets seated on the lands, then work from there . Go back to square one and load up some cases in half grain increments until you know where you start experiencing pressure signs. I look for ejection marks, stiff bolt, measure the base of the brass for expansion no greater than .004, ect. Then back off from that point and fine tune your accuracy with seating depth. Retumbo and H1000 are both good powders for the RUM. Also, when you resize your fired brass, take a piece that is chambering kind of stiff due to headspace. Run your sizing die down in your press to where it just bumps the shoulder enough to chamber that round easier. At that point you have bumped the shoulder. I would not use the brass you have that you described earlier . [/QUOTE]
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A head scratcher
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