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Rifles, Reloading, Optics, Equipment
Reloading
C.O.L Problem/Question
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<blockquote data-quote="boomtube" data-source="post: 602968" data-attributes="member: 9215"><p><em>"<u>According to Hogdon Data...the C.O.L should be set to 2.35</u>. This is not possible because of the short bullet length. If I set the bullet ... Suggestions?"</em></p><p> </p><p>Not really because there is no 'should be' to it. The listed book OAL is what the book makers used to develop the data, it means no more than that. Our rifles are different from theirs; just find what OAL can and will work for you and use it to develop your best load. You can tweak OAL for best accuracy after you find the best charge.</p><p> </p><p>Seating 'one caliber deep' has been meaningless to reloaders for more than a hundred years, proving that old ideas are slow to die! That 'rule' started in black powder cartridge days simply to make sure the bullets would stay seated in thin, soft neck cases back when large caliber cartridges were often carried in hunter's pockets. Since the early 1900s and smokeless powders we have gotten a lot of very good cartridges with necks less than one caliber long!</p><p> </p><p>Don't mix apples and oranges about bullet seating depths; OAL and pressure changes in rifles is totally different from small but high pressure pistol cartridges (such as the 9mm and .40 cals) using fast burning powders. Fact is, seating deeper in larger rifle capacity cases using much slower powders actually decreases the peak pressure while seating closer to the lands increases pressure. Seating deeper in rifles makes for a longer but very easy bullet jump which allows bullets to accelerate before impacting the rifling, then the bullet's own inertia helps it engrave the rifling; that's a proven fact, not a misguided opinion. On the other hand, seating closer to the lands makes intital bullet movement and engraving more difficult which in turn raises start and peak pressures significantly simply because the bullets can't freely move.</p></blockquote><p></p>
[QUOTE="boomtube, post: 602968, member: 9215"] [I]"[U]According to Hogdon Data...the C.O.L should be set to 2.35[/U]. This is not possible because of the short bullet length. If I set the bullet ... Suggestions?"[/I] Not really because there is no 'should be' to it. The listed book OAL is what the book makers used to develop the data, it means no more than that. Our rifles are different from theirs; just find what OAL can and will work for you and use it to develop your best load. You can tweak OAL for best accuracy after you find the best charge. Seating 'one caliber deep' has been meaningless to reloaders for more than a hundred years, proving that old ideas are slow to die! That 'rule' started in black powder cartridge days simply to make sure the bullets would stay seated in thin, soft neck cases back when large caliber cartridges were often carried in hunter's pockets. Since the early 1900s and smokeless powders we have gotten a lot of very good cartridges with necks less than one caliber long! Don't mix apples and oranges about bullet seating depths; OAL and pressure changes in rifles is totally different from small but high pressure pistol cartridges (such as the 9mm and .40 cals) using fast burning powders. Fact is, seating deeper in larger rifle capacity cases using much slower powders actually decreases the peak pressure while seating closer to the lands increases pressure. Seating deeper in rifles makes for a longer but very easy bullet jump which allows bullets to accelerate before impacting the rifling, then the bullet's own inertia helps it engrave the rifling; that's a proven fact, not a misguided opinion. On the other hand, seating closer to the lands makes intital bullet movement and engraving more difficult which in turn raises start and peak pressures significantly simply because the bullets can't freely move. [/QUOTE]
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