Tim sounds like a nice gun to me. Is the box , end label marked with a catalog number or is it plain, just says .22 caliber revolver? or is it "RSS5"??
The serial number puts it right about the time of the change-over to the larger diameter barrels, but I think it was like a year or so later thsiactually took plce. So short of measuring the actual bore (slup the bore with 'Cerrosafe' and measure the 'plug' diameter, it should be .222" diameter ,+/- .002".
After around serial number #150,000 they start to run about .224"dia. to use for the larger diameter magnum shells.
This "=/-.002" is where the trouble can come, because if you have a barrel that is running "over size" and put in ammo that may be "undersize", one can have one LARGE difference and accuracy can go right out the window. They usually don't let that happen, BUT................
Show us some pictures of your 'new' gun..........
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Patron
Dan