From the sound of your description, your gun was made way back in the day for 2 5/8 inch brass shells. All the RST 10-gauge shells I see on their web page are 2 7/8 inch. If you like to tinker, you could cut down plastic Federal or Remington hulls to 2 5/8 inch and modify a loader to handle those short cases.
A far better solution, for lazy folks like myself, is to get a pair of 10- to 12-gauge Gauge Mates and shoot light 12-gauge reloads. My 12-gauge reloads in Remington STS hulls work great in the Gauge Mates.
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