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Lapua's can be and are being built on Rem 700 actions.......
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You are correct, questionable stuff is done all the time. Sometimes it is all right, other times boo boo happens. How much is your face and eyes worth?
Read this article from Dan Lilja on large cartridges in 700 actions. Now he has a lot of experience and testing to back up his claims.
http://www.riflebarrels.com/articles...700_action.htm
Now to put this in perspective the Lapua is only .004 less in case body diameter than the two cartidges Dan is talking about.
Now Jerry Stillers TAC 338 and Predator Etreme are built for the 338 Lapua and are $875. Both are worth $875 when you leave the gunshop and not $400 like your 700 is after you have $1000 into the action and modifications.
Do what you want, but doubt you can factually say that it is "safe" or even highly advised, only your butt has not been blown up yet. Nor does it mean that it is even smart or cost effective.
BH