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The Basics, Starting Out
Pillar bedding pros & cons
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<blockquote data-quote="Fiftydriver" data-source="post: 109916" data-attributes="member: 10"><p>Bart B,</p><p></p><p>Aluminum pillars should be AT LEAST .500 in diameter and I prefer a 9/16" diameter pillar. Also they should be heat treated pillars not annealed aluminum.</p><p></p><p>With a properly heat treated pillar of this diameter, I recommend to torque the receiver screws to a range between 45 and 50 in/lbs of torque. Some recommend 65 in/lbs but I have not seen a difference in consistancy between 45 and 65 in a properly pillar bedded rifle.</p><p></p><p>I only use steel pillars for special occasions such as a very large rifle with alot of barrel weight when I need the retaining force of the mounting screws spread over a larger distance. For examply my 338 AM which has a 40" 1.750" straight cylinder barrel which is totally freefloated off the BAT 2"x10" receiver.</p><p></p><p>For an application such as this, I machine pillars with an OD of 1.000". The portion you see at the bottom of the stock is stepped down to around 0.750" for cosmetic reasons but the internal diameter is a full 1.000". There are also three of these pillars with the BAT receiver as opposed to two for most conventional receivers.</p><p></p><p>With set up like this I recommend 55 to 65 in/lbs of torque. Not because the pillars can handle more but because of the extreme increase in stress imposed to the receiver by the barrel.</p><p></p><p>So to answer your question, a properly sized and heat treated aluminum pillar will handle 65 in/lbs of torque but in a properly pillar bedded rifle this level is generally not needed.</p><p></p><p>I only recommend it in a case with an extremely heavy, long barrel.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 109916, member: 10"] Bart B, Aluminum pillars should be AT LEAST .500 in diameter and I prefer a 9/16" diameter pillar. Also they should be heat treated pillars not annealed aluminum. With a properly heat treated pillar of this diameter, I recommend to torque the receiver screws to a range between 45 and 50 in/lbs of torque. Some recommend 65 in/lbs but I have not seen a difference in consistancy between 45 and 65 in a properly pillar bedded rifle. I only use steel pillars for special occasions such as a very large rifle with alot of barrel weight when I need the retaining force of the mounting screws spread over a larger distance. For examply my 338 AM which has a 40" 1.750" straight cylinder barrel which is totally freefloated off the BAT 2"x10" receiver. For an application such as this, I machine pillars with an OD of 1.000". The portion you see at the bottom of the stock is stepped down to around 0.750" for cosmetic reasons but the internal diameter is a full 1.000". There are also three of these pillars with the BAT receiver as opposed to two for most conventional receivers. With set up like this I recommend 55 to 65 in/lbs of torque. Not because the pillars can handle more but because of the extreme increase in stress imposed to the receiver by the barrel. So to answer your question, a properly sized and heat treated aluminum pillar will handle 65 in/lbs of torque but in a properly pillar bedded rifle this level is generally not needed. I only recommend it in a case with an extremely heavy, long barrel. Kirby Allen(50) [/QUOTE]
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