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Rifles, Reloading, Optics, Equipment
Gunsmithing
Full length barrel bedding
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<blockquote data-quote="jarnold37" data-source="post: 1857032" data-attributes="member: 29241"><p>It seems that a lot is to be considered and different methods to be tried. It seems that any barrel will resonate and whip when fired. The thinner the barrel the more the whip, especially from shot to shot. When a cartridge is fired in a very light small diameter barrel, the temperature of the barrel heats quickly. The barrel would possibly whip more the hotter it became. Three shots with a 1.450 diameter barrel is not affected as much by the heat as the light barrel. I read that manufacturers put that pressure point near the end of the forearm for two reasons. One, is to dampen the resonance and whip and also to support the entire barreled action as the action does not fit precisely in the stock. I have cut this band out (floated the barrel) of factory guns and had loss of accuracy in some occasions. I assume because the action had more ability to move after each shot. So I would think if you are going to float the barrel channel it would be necessary to bed the action. I always bed from the recoil lug back to include the tang. If the tang is not supported the front screw is doing most of the support and will bend the tang with very little tightening of the rear screw. If pillar bedded, there is a chance to rock on the front pillar as there is movement due to shrinkage of the compound. I know the statistics that the compound shrinks very little, but even a little is enough to have the pillar(s) carry most of the support. Some compounds continue to shrinks for several months, even if only a very small amount. I have had good results by pouring my pillars when bedding as it is the same stability over time because aluminum pillars do not shrink at all. On large barrels, I pour a 2" pad under the barrel to help support the action due to the weight of a 30" 1.450 diameter barrel. Even after 3 quick shots with a 110 grain capacity case, there is not enough heat to notice and does not put undue stress on the bedded action</p></blockquote><p></p>
[QUOTE="jarnold37, post: 1857032, member: 29241"] It seems that a lot is to be considered and different methods to be tried. It seems that any barrel will resonate and whip when fired. The thinner the barrel the more the whip, especially from shot to shot. When a cartridge is fired in a very light small diameter barrel, the temperature of the barrel heats quickly. The barrel would possibly whip more the hotter it became. Three shots with a 1.450 diameter barrel is not affected as much by the heat as the light barrel. I read that manufacturers put that pressure point near the end of the forearm for two reasons. One, is to dampen the resonance and whip and also to support the entire barreled action as the action does not fit precisely in the stock. I have cut this band out (floated the barrel) of factory guns and had loss of accuracy in some occasions. I assume because the action had more ability to move after each shot. So I would think if you are going to float the barrel channel it would be necessary to bed the action. I always bed from the recoil lug back to include the tang. If the tang is not supported the front screw is doing most of the support and will bend the tang with very little tightening of the rear screw. If pillar bedded, there is a chance to rock on the front pillar as there is movement due to shrinkage of the compound. I know the statistics that the compound shrinks very little, but even a little is enough to have the pillar(s) carry most of the support. Some compounds continue to shrinks for several months, even if only a very small amount. I have had good results by pouring my pillars when bedding as it is the same stability over time because aluminum pillars do not shrink at all. On large barrels, I pour a 2" pad under the barrel to help support the action due to the weight of a 30" 1.450 diameter barrel. Even after 3 quick shots with a 110 grain capacity case, there is not enough heat to notice and does not put undue stress on the bedded action [/QUOTE]
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Full length barrel bedding
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