stresses related to expansion/contraction

[chevytruck_83]

Im debating on what parts to use for my next build and once again im way over analyzing everything. I really like the 3 lug 60' actions. In particular the badger unit. I was thinking about how the dual lug would effect bedding in regards to expansion and contraction with temperature. Im a steamfitter so knowing the coefficient of expansion when bolting down pipe in multiple locations is key. Thus my question.
How much effect or stress is caused by expansion and contraction due to temperature change. Assuming your like me and enjoy the challenges of shooting in all conditions. Maybe 10 below to how hot a barrel and action can get on the hottest of days. From my experience as a steamfitter it would lend me to believe a single barrel block type setup around the action lug area with the rear and barrel floating would be ideal. Instead of 2 or 3 action bolts. I know the expansion is very minimal but if your bedding job is perfect and your action screws are tight it would make me think its trying to push and pull on your bedding/stock as it expands and contracts. Is there an article on this that i havent stumbled on yet?

 

[CatShooter]

None - they action will not expand enough for you to worry about - but if you are really "over-the-hill" OCD, then get a receiver that has one bedding lug.

 

[chevytruck_83]

Not at all. Just picking the brains of the more experienced guys.

 

[MrMajestic]

Expansion Coefficient of steel is 6.5 PPM. Imperial measurements would mean .0000065" per inch per degree Fahrenheit. 100 degrees would change you .00065" per inch x 7"(?) action length= .00455". Diameter would cost you .00065 x 1.25"= .0008125. Think what your scope is doing on top! Aluminum is 13 PPM so it's doubling what your steel receiver is doing! Maybe OCD however it is critical to apply the environmental factor when using my Laser Interferometer to calibrate CNC Machine Tools. Not quite sure how you would handle it on a firearm. Doesn't seem to affect the Pro's. ???

 

[chevytruck_83]

I would love to have the means to build a rail gun with three bases. One out of wood. One aluminium and one out of steel. Then test them all in extreme cold then extreme hot to see iif any patterns can be observed.