Originally Posted by Bart B
Wel, all the epoxy bedding materials I know of expand when hot and contract when cold. Which means it doesn't make any difference if there's a round metal bushing around the stock screws and epoxy of some thickness around the rest of the receiver or no pillars at all. When it's cold, the only hard, bedding points are at the pillars; they don't shrink as much as epoxy. The rest of the receiver's not held as tight on its bottom nor any place else. With conventional epoxy bedding, there's more receiver bottom to bedding contact when it's cold; expecially around the stock screws.
Having shot the same two or three rifles in all sorts of temperatures and humidities from the 20's up to almost 100, they all held the same accuracy level with the same load. No pillar bedding. Just plain old full contact epoxy except for the bottom of the recoil lug which is clear of any epoxy.
Of course one should retorque their stock screws before each shooting situation. ths assures the same compression force at the stock screw areas regardless of the type of bedding.
The most accurate shoulder fired rifles I know of are all conventionally epoxy bedded. No pillars at all.
And don't forget; the receiver expands when hot and contracts when cold; just like pillars.
All different materials have a different coefficient of expansion. but in a properly bedded action
the bedding thickness is minimal and has little or no effect on expansion or contraction.
Most bedding materials are low shrink materials in order to maintain contact with the action
at all times
The main reason for pillars in the bedding system is to keep the action screws from crushing
the stock material to the point of yield and lowering the torque on the action screws.
All stock materials can become compressed over time with the exception of the machined
aluminum stocks. Pillars will expand and contract based on the material used but with
recomended torque loads they will not compress and remain in that condition.
If good pillars and metal to metal to metal contact is achieved re-torquing is rare unless you
remove the action from the stock.
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