What method do you use to bed a rail such as an EWG 20moa rail on say a Rem 700sa action and is it the same as any other makes?

Take the rail out of the package, apply low strength Locktite to the screws, torque to half speck, start over and torque all the screws to full spec.

Never have bedded a rail...

not a recommended process..... as FJG suggested use locktite and be done

Counts on the caliber and manufacturer of the base. Also depends on if the base has a lug. Big gun, buy a top of the line base and you don't usually need to bed. May want some clear fingernail polish. Doesn't bond to the action, but will help reduce moisture between base and action. If smaller caliber and cheaper base, I've used JB weld. There are some youtube videos that show how to do it. I've gotten rid of the cheap bases and replaced with good, more expensive bases (although I have broke a lug off a nightforce base in the past).

Is the torque spec on the package or is there a "standard" torque used?

15 inch/lbs for #6 screws *** this is the standard *** size for most factory rifles........

~20-25 inch/lbs for #8 screws