So find a good scope, as I don't know what you are looking for in a scope. I'm not trying to judge you, but based on their question, and the fact you are using a m91/30, (not a bad rifle) it sounds like you are a beginner. Again, excuse me if I am wrong.
What date is your 91/30? It can affect accuracy.
If its a 42,43,44, I would just recommend you get a scope at Walmart. If its a Russian, and another year, I still would just pick something up at a sporting goods store.
If its Finnish, invest in something nice.