I know diddly about Remingtons and prefer to keep it that way
If you have four screws left to adhere the (bases/rings?) to the scope I would try the short in the front base first.
With Savages anyway a overly long screw in the front can make contact with the barrel tenon. Not a good thing. Remington is probably not much different.
I've never seen a set of bases for a Sav that have two different screw lengths. Sometimes the cheapys are overly long and the forward most screw must be ground down to fit.
With the long screws in the rear you should be able to see if they project through the reciever. If they do the bolt will bind on them.
If they're to long in the front one will bottom out on the barrel tenon/stub and the other will bind the bolt lugs.
Play with them a bit. You'll figure out where they go.
Best advice, install just the forward most screw on the front base first and lightly snug down. If the base still moves it needs to be shortened. Thats the one screw that can affect accuracy or at the very least ruin the barrel stub threads.