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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
224 Allen Magnum testing finished............
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<blockquote data-quote="Fiftydriver" data-source="post: 114176" data-attributes="member: 10"><p>Brian,</p><p></p><p>I tested the 100 gr and 107 gr ULD RBBTs in a customers 30" 22-6mm AI and got velocities up to 3250 fps but with the 1-8 twist I never got one to hit paper except when I moved up to 30 yards and then I got a couple full profile holes.</p><p></p><p>I was getting pretty consistant accuracy at 100 yards with anything up to 3100 fps, over that and things shut off instantly, almost to the FPS which I have found is common with this type of bullet when it is spun to fast. They just let go at a certain point.</p><p></p><p>I did not test at any range other then 100 yards except when I was fire forming some cases which were in a load that produced just shy of 3000 fps. These were reliable out to 500 yards just plinking but when I tried to stretch them past that I never saw a bullet impact.</p><p></p><p>Now please keep in mind several things. The 22-6mm AI I tested the 100 and 107 gr pills with was a 1-8 3 groove Lilja. My 1-7 twist barrel on my 224 AM is also a 3 groove. It has been proven time and again that 3 groove barrels are hell on thin jacketed bullets that are heavy for their caliber driven to high velocity in a fast twist barrel.</p><p></p><p>I have no idea what a 4 groove barrel will do. I will say that I suspect the Krieger will be a true 6.5 twist barrel. Cut rifles barrels are generally spot on their advertised twist rate. A button rifled barre on the other hand will often be slightly slower then its advertised twist range.</p><p></p><p>When I get to testing another version of the 224 AM, it will be with a 1-7 twist barrel still but this will be a 5 or 6 groove barrel instead of a 3 groove.</p><p></p><p>I have no idea what you should expect from your testing but I would certainly see what happens. Even if you can get 3100 fps it will still be usible in your Clark. Certainly not what your looking for but usible. You may well play with 3200 fps in the 4 groove, just have to throw some bullets and find out.</p><p></p><p>In earlier tests with my 224 AM, I actually hit 3450 fps with the 107 gr ULD RBBT and AA8700 powder in the 26" barrel. Still, no bullets landed on paper.</p><p></p><p>In this last test, accuracy went from sub 1/2 moa up to 3100 fps to no bullets on paper over that velocity. I even had two spotters watching for bullet strikes around the target and none were seen, I am suspecting they were just spun apart.</p><p></p><p>The 107s acted nearly identical to the 100 gr pills dispite the heavier jacket. This is something that has baffled Richard and myself???</p><p></p><p>Again, I want to stress that I was only using 3 groove barrels. Do not give up testing the Wildcat 100 and 107 gr bullets because of my test results because your tests may well prove totally different!! Only way to know is to get bullets in the air.</p><p></p><p>As far as the 142 gr ULD RBBTs are concerned. I have tested them in my 257 AM as well in a couple 257 STWs in 30" barrels.</p><p></p><p>In the STW, a 1-10 will not cut it. A 1-8 will and my test barrel shot them pretty darn well even with an over sized bore(bad barrel).</p><p></p><p>In my 257 Allen Mag with the 1-7 3 groove, 3250 fps was producing fine accuracy but this round will drive a 156 gr ULD RBBT to this velocity easily. Anything above this with the 142 gr ULD RBBT was what appeared to be dusting the bullets.</p><p></p><p>For a 142 gr ULD RBBT I would recommend a 1-8 5 or 6 groove again. In your 257 Wby, I suspect you will be pushing the bullet with a 1-7 twist but I think you will probably be fine. That 3200-3250 fps range is usually the let off velocity with a J-4 jacket, I think you will be in good shape, you should be set up perfectly for the 156 gr ULD RBBTs if you need to use them. You should be able to break 3000 fps with this bullet and from my drop test numbers you will get around a BC of .800 which when combined with 3000 fps is pretty **** impressive!!!</p><p></p><p>Keep us posted as to your results!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 114176, member: 10"] Brian, I tested the 100 gr and 107 gr ULD RBBTs in a customers 30" 22-6mm AI and got velocities up to 3250 fps but with the 1-8 twist I never got one to hit paper except when I moved up to 30 yards and then I got a couple full profile holes. I was getting pretty consistant accuracy at 100 yards with anything up to 3100 fps, over that and things shut off instantly, almost to the FPS which I have found is common with this type of bullet when it is spun to fast. They just let go at a certain point. I did not test at any range other then 100 yards except when I was fire forming some cases which were in a load that produced just shy of 3000 fps. These were reliable out to 500 yards just plinking but when I tried to stretch them past that I never saw a bullet impact. Now please keep in mind several things. The 22-6mm AI I tested the 100 and 107 gr pills with was a 1-8 3 groove Lilja. My 1-7 twist barrel on my 224 AM is also a 3 groove. It has been proven time and again that 3 groove barrels are hell on thin jacketed bullets that are heavy for their caliber driven to high velocity in a fast twist barrel. I have no idea what a 4 groove barrel will do. I will say that I suspect the Krieger will be a true 6.5 twist barrel. Cut rifles barrels are generally spot on their advertised twist rate. A button rifled barre on the other hand will often be slightly slower then its advertised twist range. When I get to testing another version of the 224 AM, it will be with a 1-7 twist barrel still but this will be a 5 or 6 groove barrel instead of a 3 groove. I have no idea what you should expect from your testing but I would certainly see what happens. Even if you can get 3100 fps it will still be usible in your Clark. Certainly not what your looking for but usible. You may well play with 3200 fps in the 4 groove, just have to throw some bullets and find out. In earlier tests with my 224 AM, I actually hit 3450 fps with the 107 gr ULD RBBT and AA8700 powder in the 26" barrel. Still, no bullets landed on paper. In this last test, accuracy went from sub 1/2 moa up to 3100 fps to no bullets on paper over that velocity. I even had two spotters watching for bullet strikes around the target and none were seen, I am suspecting they were just spun apart. The 107s acted nearly identical to the 100 gr pills dispite the heavier jacket. This is something that has baffled Richard and myself??? Again, I want to stress that I was only using 3 groove barrels. Do not give up testing the Wildcat 100 and 107 gr bullets because of my test results because your tests may well prove totally different!! Only way to know is to get bullets in the air. As far as the 142 gr ULD RBBTs are concerned. I have tested them in my 257 AM as well in a couple 257 STWs in 30" barrels. In the STW, a 1-10 will not cut it. A 1-8 will and my test barrel shot them pretty darn well even with an over sized bore(bad barrel). In my 257 Allen Mag with the 1-7 3 groove, 3250 fps was producing fine accuracy but this round will drive a 156 gr ULD RBBT to this velocity easily. Anything above this with the 142 gr ULD RBBT was what appeared to be dusting the bullets. For a 142 gr ULD RBBT I would recommend a 1-8 5 or 6 groove again. In your 257 Wby, I suspect you will be pushing the bullet with a 1-7 twist but I think you will probably be fine. That 3200-3250 fps range is usually the let off velocity with a J-4 jacket, I think you will be in good shape, you should be set up perfectly for the 156 gr ULD RBBTs if you need to use them. You should be able to break 3000 fps with this bullet and from my drop test numbers you will get around a BC of .800 which when combined with 3000 fps is pretty **** impressive!!! Keep us posted as to your results!! Kirby Allen(50) [/QUOTE]
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