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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
EGW base
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<blockquote data-quote="Broz" data-source="post: 906256" data-attributes="member: 7503"><p>Just to be clear I was not referring to adding 8x40 screws. I was referring to the original #6 screws that come with EGW rails. EGW realizes they are inferior for some applications and offer for sale better quality #6 screws now.</p><p> </p><p>Although #8 screws offer more clamping force, this not the majority of what holds a rail on. It is indeed the shear strength of the mating surfaces of the rail and receiver top. It is common knowledge that over the years the tops of receivers have changed in dimension. Mfg. changes made this a challenge for the rail / mount industry. This is why some rails are made with a universal bottom in an attempt to fit these variations. In result the foot print of contact surface between rail and receiver top is diminished. So less shear strength is the net result. Bedding a rail to the receiver is not "gluing it on". It is indeed a process that gives 100% contact to the footprint between rail and receiver. Results are a stronger system and more shear strength.</p><p> </p><p>The common problem of the variation of dimension of receiver tops creates another problem. If these two mating surface are not of perfect fit the result will be the rail flexing as tightened down. This translates into the<strong><em> top</em></strong> of the rail not being true or flat when tight. Especially with some less expensive flexy rails. Then when rings are tightened down this uneven surface is transferred into the scope tube. Even a few thousands is bad juju. So now when our scope does not track correctly or hold zero we blame the scope, right?<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /> Proper bedding of these surfaces will keep the rail true on top and give the best foundation for a good working system, that stays that way. Although, some may never notice this, it is there and when allowed to will cheat our precision rifle and optics of doing what they are intended to do, and that is shoot consistently and accurately. Or we could blame the rifle or optics, right?<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /> Some may never even realize this....lightbulb</p><p> The addition of adding dowel pins to increase shear strength is an option. But it does not replace bedding by any means. It only increases shear strength and does nothing to help the accuracy and scope tube stress problems caused by the bolting together of unlike surfaces. </p><p> </p><p>I will add that my experiences with 6 of the rails this thread is about failing were on long range rifles of magnum calibers. Where heavy optics are commonly used in conjunction with recoil. In each case the problems were fixed by properly installing a good quality rail. And each rifle is still shooting well. We use these rifle to hunt at distances past 500 yards on regular basis. So this may not apply to pea shooters or BB guns. But I do feel it would probably help them. Might even see accuracy that some may never know they are missing out on. But we can always simply blame the optics or rifle, right?lightbulb</p><p> </p><p>Jeff</p></blockquote><p></p>
[QUOTE="Broz, post: 906256, member: 7503"] Just to be clear I was not referring to adding 8x40 screws. I was referring to the original #6 screws that come with EGW rails. EGW realizes they are inferior for some applications and offer for sale better quality #6 screws now. Although #8 screws offer more clamping force, this not the majority of what holds a rail on. It is indeed the shear strength of the mating surfaces of the rail and receiver top. It is common knowledge that over the years the tops of receivers have changed in dimension. Mfg. changes made this a challenge for the rail / mount industry. This is why some rails are made with a universal bottom in an attempt to fit these variations. In result the foot print of contact surface between rail and receiver top is diminished. So less shear strength is the net result. Bedding a rail to the receiver is not "gluing it on". It is indeed a process that gives 100% contact to the footprint between rail and receiver. Results are a stronger system and more shear strength. The common problem of the variation of dimension of receiver tops creates another problem. If these two mating surface are not of perfect fit the result will be the rail flexing as tightened down. This translates into the[B][I] top[/I][/B] of the rail not being true or flat when tight. Especially with some less expensive flexy rails. Then when rings are tightened down this uneven surface is transferred into the scope tube. Even a few thousands is bad juju. So now when our scope does not track correctly or hold zero we blame the scope, right?:rolleyes: Proper bedding of these surfaces will keep the rail true on top and give the best foundation for a good working system, that stays that way. Although, some may never notice this, it is there and when allowed to will cheat our precision rifle and optics of doing what they are intended to do, and that is shoot consistently and accurately. Or we could blame the rifle or optics, right?:rolleyes: Some may never even realize this....lightbulb The addition of adding dowel pins to increase shear strength is an option. But it does not replace bedding by any means. It only increases shear strength and does nothing to help the accuracy and scope tube stress problems caused by the bolting together of unlike surfaces. I will add that my experiences with 6 of the rails this thread is about failing were on long range rifles of magnum calibers. Where heavy optics are commonly used in conjunction with recoil. In each case the problems were fixed by properly installing a good quality rail. And each rifle is still shooting well. We use these rifle to hunt at distances past 500 yards on regular basis. So this may not apply to pea shooters or BB guns. But I do feel it would probably help them. Might even see accuracy that some may never know they are missing out on. But we can always simply blame the optics or rifle, right?lightbulb Jeff [/QUOTE]
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