If you have the 1920 model sporter, a real factory sportewr, that is, it will have a flat-top rear receiver bridge which is very easily drilled and tapped. Then you drill and tap the receiver ring and stick on a pair of bases and some rings and a scope..... just like any other rifle.
If you have the rear sight on your rear receiver bridge, it is just about necessary to wreck the bridge completely in order to get it flat enough to drill and tap. This is where your friends come in, and, if you ask, likely they can find you a receiver bridge that has already been wrecked...... or maybe even a commercial flat-top. But don't ruin a receiver bridge that has a usable rear sight on it. You will find that a Ross with the factory aperture sights can be an awesomely-accurate piece of equipment, even if cut down into a sporter as so very many were.
As to that rear receiver bridge, it comes off with 4 little screws, so changing them over is NO problem at all.
I recently did this to a sportered 1910 and, right now, it is wearing Weaver bases and rings and my old Bushnell 10x scope. So far, it's shooting a minute with almost anything I feed it....... serious load development hasn't started for this rifle yet.
Lotsa fun!