A 308 for varmint, it seems like a small bit of overkill. 700 yards, I can see that, but any 6 MM including the 243 will do just as well with a bullet between 65 to 75 grains. A 165 grain bullet for varmint just seems like a bad idea. Unless you consider animals over 65 lbs as varmints, maybe deer eating up your crops could be considered a varmint but most animals that are considered varmints are a lot smaller and can be taken with much less fire power.
I guess Remington will do just about anything to try and catch up on sales including calling a 308 SPS, a varmint rifle (LOL). When someone uses the word varmint, I think of Ground hogs, Squirrels, Rabbits and such. Might make sense for Coyotes but still more than what is needed for an animal that is less than 75 lbs.
Just my 2 cents, stay safe.
Jim