shoot them first
Yes, as others have stated, shoot the rifles for group, with the glass of your choice, FIRST before you slap a synthetic stock on them. Who knows what they are capable of with factory wood? And some synthetic stocks, particularly the Rem factory versions, are way to flimsy. Dropping my Rem 700 ADL in .270 into a factory walnut stock (it came with factory plastic) had a marked effect on improving accuracy.
The Rem 700 will have real walnut, even if its the ADL, that will strip and clean up well if you choose to put in the work. I hesitate to say it, but if the rifles group, and you do not want to strip and refinish, you could spray them with bed liner (heresy on walnut) and touch up as needed.
We have a S&W 1500 in '06 that has the best factory trigger I've ever shot and will plunk W-W factory 180 gr RN into tidy holes, but it is a real kicker for some reason. It's wood is quite blonde, but the sister that shoots it (honest) likes it.