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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Cooper Rifle - Long Throat?
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<blockquote data-quote="deertroy1" data-source="post: 861571" data-attributes="member: 53905"><p>I have a question about Cooper rifles. Has anyone noticed if they have a really long throat or is it just mine?</p><p> </p><p>I got mine back from Cooper last week. It's an all stainless M54 7mm-08. In setting up some handloads I noticed that I can not get anywhere near the lands with any bullet and still have the ammo fit the magazine. Most bullets would need to be about 2.9" to reach the lands. The magazine will only accept about 2.85". </p><p>One down side to this is even if the rifle shoots good, barrel life is shortened substantial. Here's a partial C&P from Shilen's web site:</p><p> </p><p><em>"Factory rifles are made with throats long enough to accept the largest bullet that is offered in factory ammunition for that chambering. So if the throat is long enough to accept a 200 grain bullet and you only want to use 150 grain bullets, then the throat is so deep you can't get the bullets close to the lands and keep them in the case. What this amounts to is the factory reamed out a couple of hundred thousandths (or more) of lands and grooves in the throat, which shortens the accurate life of the barrel by as much as 50%."</em></p><p> </p><p><img src="http://i1233.photobucket.com/albums/ff382/deertroy1/IMG_0536_zps91775286.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="deertroy1, post: 861571, member: 53905"] I have a question about Cooper rifles. Has anyone noticed if they have a really long throat or is it just mine? I got mine back from Cooper last week. It's an all stainless M54 7mm-08. In setting up some handloads I noticed that I can not get anywhere near the lands with any bullet and still have the ammo fit the magazine. Most bullets would need to be about 2.9" to reach the lands. The magazine will only accept about 2.85". One down side to this is even if the rifle shoots good, barrel life is shortened substantial. Here's a partial C&P from Shilen's web site: [I]"Factory rifles are made with throats long enough to accept the largest bullet that is offered in factory ammunition for that chambering. So if the throat is long enough to accept a 200 grain bullet and you only want to use 150 grain bullets, then the throat is so deep you can't get the bullets close to the lands and keep them in the case. What this amounts to is the factory reamed out a couple of hundred thousandths (or more) of lands and grooves in the throat, which shortens the accurate life of the barrel by as much as 50%."[/I] [IMG]http://i1233.photobucket.com/albums/ff382/deertroy1/IMG_0536_zps91775286.jpg[/IMG] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Cooper Rifle - Long Throat?
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