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Rifles, Reloading, Optics, Equipment
Reloading
Barrel Length and Chamber Pressure
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<blockquote data-quote="J E Custom" data-source="post: 1772248" data-attributes="member: 2736"><p>Yes. shorter COAL and farther from the lands will lower the pressure. The norm is that If you are .020 to .030 off the lands pressure will be less than If you are seated against the lands. Some bullets like different amounts of jump, so you have to find out what your barrel and bullet combination likes.</p><p></p><p>I have a good friend that likes and only shoots Berger's and was having trouble with accuracy in one rifle/barrel and finally started backing off the lands in .010 thousandths Each time he would add .010 more the rifles accuracy improved. He kept going to see where it would top out and he ended up with .110 off the lands with the Berger and got great accuracy even though everyone was telling him, you need to seat the Berger's against the lands. the length they gave you is their recommendation and is normally good information, But all barrels and chambers are not equal and the jump has to be found on each rifle/cartridge to get the most out of it. </p><p></p><p>I start all of my rifles at mag length Minus .020 and go from there. On all of my big wildcats (Everything with powder charges over 90 grains I design in more freebore to keep the pressure under control and velocity up. Accuracy in these cartridges rely on excellent quality ammo (Very concentric). </p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1772248, member: 2736"] Yes. shorter COAL and farther from the lands will lower the pressure. The norm is that If you are .020 to .030 off the lands pressure will be less than If you are seated against the lands. Some bullets like different amounts of jump, so you have to find out what your barrel and bullet combination likes. I have a good friend that likes and only shoots Berger's and was having trouble with accuracy in one rifle/barrel and finally started backing off the lands in .010 thousandths Each time he would add .010 more the rifles accuracy improved. He kept going to see where it would top out and he ended up with .110 off the lands with the Berger and got great accuracy even though everyone was telling him, you need to seat the Berger's against the lands. the length they gave you is their recommendation and is normally good information, But all barrels and chambers are not equal and the jump has to be found on each rifle/cartridge to get the most out of it. I start all of my rifles at mag length Minus .020 and go from there. On all of my big wildcats (Everything with powder charges over 90 grains I design in more freebore to keep the pressure under control and velocity up. Accuracy in these cartridges rely on excellent quality ammo (Very concentric). J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Barrel Length and Chamber Pressure
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