Marks_21,
Like Gostrider, I have a nice condition Rem.#4. I have a small quantity of Western and CIL 25 Stevens long rimfire ammo. The CIL chronographs about 1080 fps which is a little slower than it is listed. On the other hand the ammo is pretty old, so I'm grateful it fires. Based on this, I would guess the shorts would do about 900 fps or less. I might be interested if the price is right and they are smokeless. PM me if you want to move them.
Mike