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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Lightweight 7mm Allen Magnum pics....
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<blockquote data-quote="Fiftydriver" data-source="post: 118585" data-attributes="member: 10"><p>Got out early this morning for the first range test of my lightweight 7mm AM looking for velocity testing and stability testing.</p><p></p><p>This is the first time I have personally used a 1-9 twist 6 groove Lilja barrel with my 7mm AM and the 200 gr ULD RBBT. Combine that with the very light #3 contour 27" barrel and I was very curious what to expect.</p><p></p><p>First test went pretty good. Conditions were 65 degrees with 90% humidity!!! It was sticky out there this morning, alot of rain yesterday.</p><p></p><p>My load consistated of formed Norma cases(had 100 new cases to use up. Very good quality but MUCH softer then Lapua hulls), Hodgdons new US869 powder, Fed 215 primers and the Wildcat 200 gr ULD RBBT seated to an over all length of 3.625".</p><p></p><p>Just for reference, in this rifle, an OAL of 3.660" will just touch the lands. We are finding that jamming these long bullets into the lands may be causing some bullet integrity issues so I am testing OAL to see what happens.</p><p></p><p>Basically I am jumping them 35 thou to the lands.</p><p></p><p>Here are the velocity results:</p><p></p><p>95.0...................2899 fps</p><p>96.0...................2952 fps</p><p>97.0...................2987 fps</p><p>98.0...................3026 fps</p><p>99.0...................3044 fps</p><p>100.0..................3066 fps</p><p>101.0..................3097 fps</p><p>102.0..................3143 fps</p><p>103.0..................3170 fps</p><p>104.0..................3202 fps</p><p></p><p>The rifle grouped at right at 1/2" ctc with the first two shots of each group. This is not uncommon with a barrel of this small contour with a very long bullet and a very large case capacity. I learned long ago that testing this type of rifle, that two shots are about all you will get with a true idea of what the rifle will do accuracy wise. Let her cool and then shoot another two and they will print tight as well.</p><p></p><p>Looking at the fired cases, only loads 103 and 104 had any real sign of an ejector mark on the case head. And only the 104 gr load had any change in bolt lift. All loads ejected like they were not even there.</p><p></p><p>When I got back to the bench, I was not suprised with what I found. The 104.0 gr load had slightly loosened the primer pocket. It is still a very usible case but it did loosen the pockets grip on the primer so I consider the 103 and 104 gr loads to hot for this rifle combo and consider 102.0 gr as the max working load for this rifle in these conditions.</p><p></p><p>That said, next test will be long range stability so I am going to reload these cases with 101.0 gr which should average right at 3100 fps in this rifle and test them at 800 yards to see how they perform to give a true understanding of how the 1-9 twist is spinning these big bullets.</p><p></p><p>Just for comparision, in the rifle I used last fall hunting in Canada, 103 gr WC872 produced 3175 fps with the same bullet but in a 30" barrel. My new rifle with this new load will easily get within 25 fps of this load with 3" less barrel length and 4 lbs less rifle.</p><p></p><p>As to the recoil of this rifle fitted with one of Shawn Carlocks small diameter brakes, it is not all warm and fuzzy but I would class the full tilt loads in the same class as a 270 Win load at the most in a 7 lb rifle. You know it goes off but its easy to handle and shoot accurately.</p><p></p><p>I did take the brake off for the 104 gr load and recoil was noticably more then a factory sporter weight 300 RUM loaded with a 180 gr pill to 3350 fps. It wakes you right up, put the brake right back on after that!!! /ubbthreads/images/graemlins/grin.gif</p><p></p><p>I am very impressed with this brake design that Shawn has come up with. For its small diameter, it does a VERY good job controlling recoil especially on a rifle of this weight and this size of chambering.</p><p></p><p>All in all, first test was a success, now onto serious testing, 800 yards. This will tell the story!!!</p><p></p><p>More to come soon, I hope to get out early in the morning for this test.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 118585, member: 10"] Got out early this morning for the first range test of my lightweight 7mm AM looking for velocity testing and stability testing. This is the first time I have personally used a 1-9 twist 6 groove Lilja barrel with my 7mm AM and the 200 gr ULD RBBT. Combine that with the very light #3 contour 27" barrel and I was very curious what to expect. First test went pretty good. Conditions were 65 degrees with 90% humidity!!! It was sticky out there this morning, alot of rain yesterday. My load consistated of formed Norma cases(had 100 new cases to use up. Very good quality but MUCH softer then Lapua hulls), Hodgdons new US869 powder, Fed 215 primers and the Wildcat 200 gr ULD RBBT seated to an over all length of 3.625". Just for reference, in this rifle, an OAL of 3.660" will just touch the lands. We are finding that jamming these long bullets into the lands may be causing some bullet integrity issues so I am testing OAL to see what happens. Basically I am jumping them 35 thou to the lands. Here are the velocity results: 95.0...................2899 fps 96.0...................2952 fps 97.0...................2987 fps 98.0...................3026 fps 99.0...................3044 fps 100.0..................3066 fps 101.0..................3097 fps 102.0..................3143 fps 103.0..................3170 fps 104.0..................3202 fps The rifle grouped at right at 1/2" ctc with the first two shots of each group. This is not uncommon with a barrel of this small contour with a very long bullet and a very large case capacity. I learned long ago that testing this type of rifle, that two shots are about all you will get with a true idea of what the rifle will do accuracy wise. Let her cool and then shoot another two and they will print tight as well. Looking at the fired cases, only loads 103 and 104 had any real sign of an ejector mark on the case head. And only the 104 gr load had any change in bolt lift. All loads ejected like they were not even there. When I got back to the bench, I was not suprised with what I found. The 104.0 gr load had slightly loosened the primer pocket. It is still a very usible case but it did loosen the pockets grip on the primer so I consider the 103 and 104 gr loads to hot for this rifle combo and consider 102.0 gr as the max working load for this rifle in these conditions. That said, next test will be long range stability so I am going to reload these cases with 101.0 gr which should average right at 3100 fps in this rifle and test them at 800 yards to see how they perform to give a true understanding of how the 1-9 twist is spinning these big bullets. Just for comparision, in the rifle I used last fall hunting in Canada, 103 gr WC872 produced 3175 fps with the same bullet but in a 30" barrel. My new rifle with this new load will easily get within 25 fps of this load with 3" less barrel length and 4 lbs less rifle. As to the recoil of this rifle fitted with one of Shawn Carlocks small diameter brakes, it is not all warm and fuzzy but I would class the full tilt loads in the same class as a 270 Win load at the most in a 7 lb rifle. You know it goes off but its easy to handle and shoot accurately. I did take the brake off for the 104 gr load and recoil was noticably more then a factory sporter weight 300 RUM loaded with a 180 gr pill to 3350 fps. It wakes you right up, put the brake right back on after that!!! [img]/ubbthreads/images/graemlins/grin.gif[/img] I am very impressed with this brake design that Shawn has come up with. For its small diameter, it does a VERY good job controlling recoil especially on a rifle of this weight and this size of chambering. All in all, first test was a success, now onto serious testing, 800 yards. This will tell the story!!! More to come soon, I hope to get out early in the morning for this test. Good Shooting!! Kirby Allen(50) [/QUOTE]
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