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Rifles, Reloading, Optics, Equipment
Reloading
27” barrel
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<blockquote data-quote="johnnyk" data-source="post: 1991088" data-attributes="member: 307"><p>Sendero6, haven't had a chance to welcome you yet but glad your here. Welcome brother!</p><p></p><p>Here's an excerpt from Accurate Shooter.com</p><p>"In the simplest terms, a very big case pushing a relatively small diameter bullet is acknowledged as the classic overbore design. But it's not just large powder capacity that creates an overbore situation — it is the relationship between powder capacity and barrel bore diameter." Good read. </p><p>( <a href="https://www.accurateshooter.com/technical-articles/overbore-cartridges-defined-by-formula/" target="_blank">https://www.accurateshooter.com/technical-articles/overbore-cartridges-defined-by-formula/</a> )</p><p></p><p>I'm of the opinion that it's not the longer barrel that will allow you to load a particular cartridge "hotter" but actually the chambers design. Think .257 Weatherby for a moment. Roy filled the case with the slowest burning powders that he could find and put some .378" of freebore in the lede of the barrel to keep the pressures down while still delivering substantially higher velocities.</p><p>Others are doing similar things, for instance; I used a Ryan Mantha reamer in my SAAMI .300 WinMag chamber and created a bit of freebore. This allows me to seat the 215gn Berger out to 3.7xxx" and with this extra case space I can incrementally bump up the powder charge to get more velocity. Hornady calls this "more head room" or I think it was them. Their Creedmore and PRC cartridges use this concept and let them market the 6.5 CM being better than the .260 Remington when using heavier (140gn) bullets. Do a search for "How to Increase you rifle throat length with a Chamber Uni Throating Reamer".</p><p>I've also read of shooters/reloaders doing the same thing with revolver cartridges. By extending the bullets to just shy of the beginning of the cylinder, this allows for more powder. The concept has been around for years though.</p><p>Good luck with your 26N.</p></blockquote><p></p>
[QUOTE="johnnyk, post: 1991088, member: 307"] Sendero6, haven't had a chance to welcome you yet but glad your here. Welcome brother! Here's an excerpt from Accurate Shooter.com "In the simplest terms, a very big case pushing a relatively small diameter bullet is acknowledged as the classic overbore design. But it’s not just large powder capacity that creates an overbore situation — it is the relationship between powder capacity and barrel bore diameter." Good read. ( [URL]https://www.accurateshooter.com/technical-articles/overbore-cartridges-defined-by-formula/[/URL] ) I'm of the opinion that it's not the longer barrel that will allow you to load a particular cartridge "hotter" but actually the chambers design. Think .257 Weatherby for a moment. Roy filled the case with the slowest burning powders that he could find and put some .378" of freebore in the lede of the barrel to keep the pressures down while still delivering substantially higher velocities. Others are doing similar things, for instance; I used a Ryan Mantha reamer in my SAAMI .300 WinMag chamber and created a bit of freebore. This allows me to seat the 215gn Berger out to 3.7xxx" and with this extra case space I can incrementally bump up the powder charge to get more velocity. Hornady calls this "more head room" or I think it was them. Their Creedmore and PRC cartridges use this concept and let them market the 6.5 CM being better than the .260 Remington when using heavier (140gn) bullets. Do a search for "How to Increase you rifle throat length with a Chamber Uni Throating Reamer". I've also read of shooters/reloaders doing the same thing with revolver cartridges. By extending the bullets to just shy of the beginning of the cylinder, this allows for more powder. The concept has been around for years though. Good luck with your 26N. [/QUOTE]
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Reloading
27” barrel
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