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Rifles, Reloading, Optics, Equipment
Reloading
Radical difference between Nosler 210 Gr Long Range and Hornady 208 Gr ELD-M
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<blockquote data-quote="QuietTexan" data-source="post: 2062243" data-attributes="member: 116181"><p>The CBTO measurement doesn't account for length of the bullet, bearing surface, or boat tail, all of which will make bullets behave differently. CBTO is one thing in relation to determining the distance from ogive to the lands, but the engagement of two different types of ogives will be different. Other critical dimensions would be the placement of the bullet base relative to the case neck/shoulder junction and amount of bullet bearing surface in the neck. All of these impact the engagement of the bearing surface to the lands, which is what the simplified "CBTO" measurement is accomplishing.</p><p></p><p>The ELD-M has a secant ogive, the ABLR has a tangent ogive. The annoying but truthful answer is the two bullets are different, and need to be measured and worked up separately. The good news is tangent ogive bullets should be less sensitive to seating depth and easier to re-tune.</p><p></p><p>I'm not surprised at all that they're behaving as differently for Les as they are. Lot's of horizontal dispersion, so I would back down off the load a few grains, adjust seating depth, then work the powder back up, while keeping everything else (ie neck tension) constant to reduce the amount of changing variables.</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2062243, member: 116181"] The CBTO measurement doesn't account for length of the bullet, bearing surface, or boat tail, all of which will make bullets behave differently. CBTO is one thing in relation to determining the distance from ogive to the lands, but the engagement of two different types of ogives will be different. Other critical dimensions would be the placement of the bullet base relative to the case neck/shoulder junction and amount of bullet bearing surface in the neck. All of these impact the engagement of the bearing surface to the lands, which is what the simplified "CBTO" measurement is accomplishing. The ELD-M has a secant ogive, the ABLR has a tangent ogive. The annoying but truthful answer is the two bullets are different, and need to be measured and worked up separately. The good news is tangent ogive bullets should be less sensitive to seating depth and easier to re-tune. I'm not surprised at all that they're behaving as differently for Les as they are. Lot's of horizontal dispersion, so I would back down off the load a few grains, adjust seating depth, then work the powder back up, while keeping everything else (ie neck tension) constant to reduce the amount of changing variables. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Radical difference between Nosler 210 Gr Long Range and Hornady 208 Gr ELD-M
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