25-20's are one of the hardest calibers to find in the model 219.
Don't put a scope on it, it will destroy the value. I know some collectors would pay over $500 for one in the shape your claiming it's in so don't go making it a $100 gun by scoping the poor thing.
As for shooting it, go for it. I've got one in 25-20 as well and I have a hoot poking away with it at the range. It'll fire factory offerings of today with ease.
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