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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6mm rem or 6mmAI
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<blockquote data-quote="Trickymissfit" data-source="post: 451526" data-attributes="member: 25383"><p>here's the deal on getting a 6mm Ackley to really zing. First thing is that you need to find a good supply of really old .257 Roberts brass from Remington (maybe Winchester too). The case walls are thinner, and hold 1.5 to a full 2 grains more powder than the standard 6mm case. This will get you about 75 fps alone (I saw slightly over 100 fps with 80 grain Blitzes). The Ackley chamber was not developed for an increase of velocity, but to increase case life by decreasing brass flow (Akley felt the 57mm case was about max for a 6mm). The increase in velocity was just something that was added to the equation. Also the basic 6mm case will handle about 10% greater chamber pressure than the basic .243 case if you like to really tax your action. To really see gains with a 6mmAI, you need to be thinking about those 100+ grain bullets in a fast twist barrel. Setup right it will be about 75fps to 100fps faster than a 6/.284, and have a barrel that will often last two and a half time longer.</p><p> </p><p> Now 3450 fps with an 85 grain Hornaday seems about right. I got that using .257 cases in a standard 6mm remington chamber from a 24" barrel (actually was one of my favorite loads, but had a lot of recoil for what it was). If you go with the Ackley chamber and really push the envelope, you want a fairly heavy barrel (I think a #7 is about right). This is not a gun you want to set over a P.D. town all afternoon long. It will get old. But as a coyote rifle, it's the nuts! You should be able to make kills close to 700 yards (670 was my longest). And pelt damage is like nothing you've seen before! The bad side is that you can forget about half the varmit bullets out there. I've had a few explode in flight, and many blow up a cardboard target backstop. So you want fair heavy constructed bullets, and this is where the 85 thru 90 grain bullets shine. Learn to like H450 powder, and have fun</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 451526, member: 25383"] here's the deal on getting a 6mm Ackley to really zing. First thing is that you need to find a good supply of really old .257 Roberts brass from Remington (maybe Winchester too). The case walls are thinner, and hold 1.5 to a full 2 grains more powder than the standard 6mm case. This will get you about 75 fps alone (I saw slightly over 100 fps with 80 grain Blitzes). The Ackley chamber was not developed for an increase of velocity, but to increase case life by decreasing brass flow (Akley felt the 57mm case was about max for a 6mm). The increase in velocity was just something that was added to the equation. Also the basic 6mm case will handle about 10% greater chamber pressure than the basic .243 case if you like to really tax your action. To really see gains with a 6mmAI, you need to be thinking about those 100+ grain bullets in a fast twist barrel. Setup right it will be about 75fps to 100fps faster than a 6/.284, and have a barrel that will often last two and a half time longer. Now 3450 fps with an 85 grain Hornaday seems about right. I got that using .257 cases in a standard 6mm remington chamber from a 24" barrel (actually was one of my favorite loads, but had a lot of recoil for what it was). If you go with the Ackley chamber and really push the envelope, you want a fairly heavy barrel (I think a #7 is about right). This is not a gun you want to set over a P.D. town all afternoon long. It will get old. But as a coyote rifle, it's the nuts! You should be able to make kills close to 700 yards (670 was my longest). And pelt damage is like nothing you've seen before! The bad side is that you can forget about half the varmit bullets out there. I've had a few explode in flight, and many blow up a cardboard target backstop. So you want fair heavy constructed bullets, and this is where the 85 thru 90 grain bullets shine. Learn to like H450 powder, and have fun gary [/QUOTE]
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