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Rifles, Reloading, Optics, Equipment
Reloading
Ackley Improved Education
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<blockquote data-quote="VinceMule" data-source="post: 3069252" data-attributes="member: 122164"><p>My experience has been with more varmint cartridges</p><p></p><p>17 Ackley Hornet-4</p><p>22 K Hornet-2</p><p>223 AI-8</p><p>22/250 AI*-12+</p><p>6BR Ackley Improved</p><p>6/250 AI-2</p><p>243 AI-8+</p><p>6 Rem AI-4</p><p>25/06 AI-1</p><p>260 AI-2</p><p>6.5 Rem Mag AI-1</p><p>280 AI-4</p><p></p><p>All varmint cartridges were fire formed while hunting, deer cartridges FF'd with Bullseye and cream of wheat.</p><p></p><p>The only cartridge I considered a waste of time and funds was the 22 K Hornet.</p><p></p><p>PO Ackley spoke of the "interference point". If you take a reamer print, draw lines on the Shoulder, now look where they intersect. The Interference Point is a focal point where powder gases converge, which has a huge impact on throat growth. </p><p></p><p>So, there are two ways to take advantage of the Interference Point, change the shoulder angle to where those lines intersect in the back of the neck and second, make the neck longer. I have played with Making the necks longer on Formed cases, and have verified that PO Ackley's theory is indeed correct. When you make the necks longer, a piloted neck reamer is used in the chamber to make the neck longer, then a unithroater is used to cut the freebore you want to length. The pay off in barrel life is substantial with 35*-40* shoulders with long necks.</p><p></p><p>For what ever it is worth, I have had many conversations with Dave Kiff about these issues, and it is of his opinion that improving past a 37* shoulder angle is wasted.</p><p></p><p>As far as feeding issues, I had to modify the Ruger 77 Mark II feed rail for the 17 Ackley Hornet, and the 223 AI does not feed well in the stock 700, but changing to detachable mags fixes that problem. All the other larger cases have had no feeding problems on Rem 700's and Rugers 77s that I and friends have used.</p></blockquote><p></p>
[QUOTE="VinceMule, post: 3069252, member: 122164"] My experience has been with more varmint cartridges 17 Ackley Hornet-4 22 K Hornet-2 223 AI-8 22/250 AI*-12+ 6BR Ackley Improved 6/250 AI-2 243 AI-8+ 6 Rem AI-4 25/06 AI-1 260 AI-2 6.5 Rem Mag AI-1 280 AI-4 All varmint cartridges were fire formed while hunting, deer cartridges FF'd with Bullseye and cream of wheat. The only cartridge I considered a waste of time and funds was the 22 K Hornet. PO Ackley spoke of the "interference point". If you take a reamer print, draw lines on the Shoulder, now look where they intersect. The Interference Point is a focal point where powder gases converge, which has a huge impact on throat growth. So, there are two ways to take advantage of the Interference Point, change the shoulder angle to where those lines intersect in the back of the neck and second, make the neck longer. I have played with Making the necks longer on Formed cases, and have verified that PO Ackley's theory is indeed correct. When you make the necks longer, a piloted neck reamer is used in the chamber to make the neck longer, then a unithroater is used to cut the freebore you want to length. The pay off in barrel life is substantial with 35*-40* shoulders with long necks. For what ever it is worth, I have had many conversations with Dave Kiff about these issues, and it is of his opinion that improving past a 37* shoulder angle is wasted. As far as feeding issues, I had to modify the Ruger 77 Mark II feed rail for the 17 Ackley Hornet, and the 223 AI does not feed well in the stock 700, but changing to detachable mags fixes that problem. All the other larger cases have had no feeding problems on Rem 700's and Rugers 77s that I and friends have used. [/QUOTE]
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