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Rifles, Reloading, Optics, Equipment
Reloading
7-08 Help
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<blockquote data-quote="MAD10" data-source="post: 2156565" data-attributes="member: 29370"><p>Great glad to help! btw I assume you already have a chamber cut and you are working backwards "so to speak" if so, do not be too alarmed if you discover your jump is more than what is considered "normal" </p><p></p><p>There is quite a few guys running jump tests today and we are learning many of us put too much emphasis in jump. ALL THINGS BEING EQUAL the jump has very little to do with accuracy or ES. Of much more importance is the overall concentricity and consistency of the cartridge (factory or your own) and the alignment of your bore to your chamber. </p><p></p><p>Case in point, I had a chamber cut to have a 20 thou jump with oberndorf bottom metal. Later, I decided to switch to Hawkins bottom metal with dbms....since I had to seat the bullets further in the case to fit in the dbms my jump increased by 60 thou. Fortunately for me it made no difference if I was 20 or 80 K off the lands...I still saw similar velocities and accuracy.</p></blockquote><p></p>
[QUOTE="MAD10, post: 2156565, member: 29370"] Great glad to help! btw I assume you already have a chamber cut and you are working backwards "so to speak" if so, do not be too alarmed if you discover your jump is more than what is considered "normal" There is quite a few guys running jump tests today and we are learning many of us put too much emphasis in jump. ALL THINGS BEING EQUAL the jump has very little to do with accuracy or ES. Of much more importance is the overall concentricity and consistency of the cartridge (factory or your own) and the alignment of your bore to your chamber. Case in point, I had a chamber cut to have a 20 thou jump with oberndorf bottom metal. Later, I decided to switch to Hawkins bottom metal with dbms....since I had to seat the bullets further in the case to fit in the dbms my jump increased by 60 thou. Fortunately for me it made no difference if I was 20 or 80 K off the lands...I still saw similar velocities and accuracy. [/QUOTE]
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Reloading
7-08 Help
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