The .22 Long Rifle has been around since 1887, so I think it is safe to say that any bolt action .22 not specifically marked for .22 Short, was made for .22 LR.
The normal way of mounting a scope on rifles like that is to use a side mount, but to be honest, that rifle is in such poor shape that I wouldn't spend any money on it. It has earned retirement, and I think it deserves it. There are many later and better .22 rifles looking for a good home that are already grooved for a scope and have the right stocks.
Jim
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