does bedding a rail make a diiference?

It depends how well/bad it fit in the first place. The clamping force of the screws is quite capable of bending the rail to the action or visversa. Whether bedding it will make a difference you can measure on target is another thing; but it can make a difference you can detect with a straight-edge and that can translate to stress on the scope tube.

Accuracy searches seems to be more about finding 100 little things that might work and hoping that the combination adds up to something that will work. It keeps us distracted from accuracy being mostly about the barrel. ;)
 
I echo Dogleg’s response.

It doesn’t “hurt”.... by that I mean, there isn’t a downside, other than time and effort (and cost if you aren’t doing it yourself)...

It also doesn’t make a measurable differance to 99.9% of the shooters out there that would consider doing it or having it done.

This reminds me a quote, from years gone by, about guns, equipment and the shooting sports (or any sport in general). “If you think it makes a differance, then it does”.

John
 
For how easily it is done at home with some JB weld, painters tape, and a release agent to prevent the JB weld from bonding to the action, I don’t see a downside to it. It’s only up from here.
 
As the above 2 posters point out, it can't hurt however if you are using a rail that actually fits the action it is not necessary. A majority of rails are made simply having 3 flats that has minimal contact with the action which is a cheap way to make a rail. More importantly I believe is to ensure that the holes in the action are truly in the center of the bore. With Remington's QC being less than stellar these days we see more and more actions that require the rail mounting to be re-drilled and tapped to get them in center of bore.
 
check the rail topside with a good straight edge. any deviation will be magnified by the height of the rings. the most precise rings will not compensate for a wonky rail.
 
On my 700, when I installed the front screws on a 0MOA EGW rail, there was a couple thou gap on the rear end of the rail. I had to bed the rear rail. On a 20MOA rail, it was a perfect fit and didn't need to be bedded. I placed an engineering straight edge that supposed to be 0.002" accurate along the rail and no daylight.
 
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