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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
WARNING: NORMA "Whitetail" 6.5 Creedmoor 140gr. SP ammunition- Overpressure!
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<blockquote data-quote="bert2368" data-source="post: 2337432" data-attributes="member: 93675"><p>If any who have the ammunition and measuring tools on hand could measure & post, it would be interesting to know?</p><p></p><p> A: Base to ogive measurement of a few of your NORMA Whitetail cartridges, including lot number(s) for reference.</p><p></p><p>B: Bolt face to engagement with rifling measurement of your rifle.</p><p></p><p>Ideally, base to ogive SHOULD be a bit shorter than bolt face to rifling! Telescoping the bullet back into an already hot load can't be helping matters if our AR throats are all too short.</p><p></p><p>I've read elsewhere that the "Hornady Black" 140gr. load/American Gunner 140gr. load were developed for AR shooters in response to similar issues caused by other 140gr. and heavier bullet Hornady match loads run in 6.5 CM ARs contacting rifling when chambered, also reports of Hornady telling people who contacted them about high pressure signs in 6.5 CM ARs NOT to use some types of their match ammo in ARs, but run the Hornady Black instead.</p><p></p><p>Also: of all the types of factory ammunition I've fired so far in my rifle, HORNADY BLACK 140 FMJ WAS THE MOST ACCURATE. Unfortunately Hornady quit making the 6.5 CM "Black" & I've fired all I had of this ammo, I can't measure & compare. Does anyone have a few rounds left to check base to ogive?</p><p></p><p>I have never ejected a chambered round of this NORMA 140gr. Whitetail ammunition from my rifle without firing it and inspected the bullet for "ring around the ogive". When I get back after this weekend, I'll be taking such measurements & trying to cycle a round through without firing & inspecting for any marks left on bullet.</p></blockquote><p></p>
[QUOTE="bert2368, post: 2337432, member: 93675"] If any who have the ammunition and measuring tools on hand could measure & post, it would be interesting to know? A: Base to ogive measurement of a few of your NORMA Whitetail cartridges, including lot number(s) for reference. B: Bolt face to engagement with rifling measurement of your rifle. Ideally, base to ogive SHOULD be a bit shorter than bolt face to rifling! Telescoping the bullet back into an already hot load can't be helping matters if our AR throats are all too short. I've read elsewhere that the "Hornady Black" 140gr. load/American Gunner 140gr. load were developed for AR shooters in response to similar issues caused by other 140gr. and heavier bullet Hornady match loads run in 6.5 CM ARs contacting rifling when chambered, also reports of Hornady telling people who contacted them about high pressure signs in 6.5 CM ARs NOT to use some types of their match ammo in ARs, but run the Hornady Black instead. Also: of all the types of factory ammunition I've fired so far in my rifle, HORNADY BLACK 140 FMJ WAS THE MOST ACCURATE. Unfortunately Hornady quit making the 6.5 CM "Black" & I've fired all I had of this ammo, I can't measure & compare. Does anyone have a few rounds left to check base to ogive? I have never ejected a chambered round of this NORMA 140gr. Whitetail ammunition from my rifle without firing it and inspected the bullet for "ring around the ogive". When I get back after this weekend, I'll be taking such measurements & trying to cycle a round through without firing & inspecting for any marks left on bullet. [/QUOTE]
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WARNING: NORMA "Whitetail" 6.5 Creedmoor 140gr. SP ammunition- Overpressure!
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