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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
steel base and aluminum rings issues?
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<blockquote data-quote="westcliffe01" data-source="post: 530000" data-attributes="member: 35183"><p>So the comments on the ring positions will vary from scope to scope and rifle to rifle. Most of us try to get the rings as far apart as we can, while maintaining appropriate eye relief. Sometimes thats not an option. I have a savage 24 with a short aluminum scope rail which was machined from a standard one piece rail. This is not too common a gun and no-one seems to make scope mounts for it anymore. In this case, the rings are further apart than the fastening screws, since the break action receiver is so short and it has a very skinny 222 barrel emerging out the end.</p><p></p><p>The main difference between the 2 and one piece rails is lateral stability. The 2 piece bases are able to twist (rotate) or shift sideways more readily than a one piece rail, which has to bend to do the same thing. That is why the perception exists that a one piece rail is more rigid. Granted, my experience in this problem is related to a field where the thermal gradient is much larger and therefore the deflection of the components is greater. However, the goal in my job is to make the assembly stay together (attached) and not maintain sub MOA alignment.</p><p></p><p>Many people do not loctite the rail onto the receiver and therefore, whichever end is loosest will simply slide when severe expansion or contraction occurs. Trying to achieve this reliably in assembly is a near impossible problem, since the torque of the front and rear screws would have to be different and the smoothness of the rail surface and the front and back of the receiver would have to be consistent too. These conditions typically do not exist in mass produced parts like rifles and scope bases.</p><p></p><p>The impact of expansion and contraction on a scope tube with a diameter of 25.4 or 30mm is in the axial direction, and tubes of that kind can take those loads pretty well. Being round, they have essentially the same strength in bending in all directions. However, the scope base with its thin cross section has a weakness and it does not take too much to deflect it up or down. Side to side is not going to happen. This is the reason why integral scope bases (machined into the receiver) are always going to be superior and one can dispense with the rail altogether. All of the best receivers have them, or offer them as an option on a custom build.</p></blockquote><p></p>
[QUOTE="westcliffe01, post: 530000, member: 35183"] So the comments on the ring positions will vary from scope to scope and rifle to rifle. Most of us try to get the rings as far apart as we can, while maintaining appropriate eye relief. Sometimes thats not an option. I have a savage 24 with a short aluminum scope rail which was machined from a standard one piece rail. This is not too common a gun and no-one seems to make scope mounts for it anymore. In this case, the rings are further apart than the fastening screws, since the break action receiver is so short and it has a very skinny 222 barrel emerging out the end. The main difference between the 2 and one piece rails is lateral stability. The 2 piece bases are able to twist (rotate) or shift sideways more readily than a one piece rail, which has to bend to do the same thing. That is why the perception exists that a one piece rail is more rigid. Granted, my experience in this problem is related to a field where the thermal gradient is much larger and therefore the deflection of the components is greater. However, the goal in my job is to make the assembly stay together (attached) and not maintain sub MOA alignment. Many people do not loctite the rail onto the receiver and therefore, whichever end is loosest will simply slide when severe expansion or contraction occurs. Trying to achieve this reliably in assembly is a near impossible problem, since the torque of the front and rear screws would have to be different and the smoothness of the rail surface and the front and back of the receiver would have to be consistent too. These conditions typically do not exist in mass produced parts like rifles and scope bases. The impact of expansion and contraction on a scope tube with a diameter of 25.4 or 30mm is in the axial direction, and tubes of that kind can take those loads pretty well. Being round, they have essentially the same strength in bending in all directions. However, the scope base with its thin cross section has a weakness and it does not take too much to deflect it up or down. Side to side is not going to happen. This is the reason why integral scope bases (machined into the receiver) are always going to be superior and one can dispense with the rail altogether. All of the best receivers have them, or offer them as an option on a custom build. [/QUOTE]
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steel base and aluminum rings issues?
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