If a 38 S&W round fits in the chambers, they have not been sleeved and I would not shoot 38 Specials in the gun. If 38 S&W does not fit in the chamber it has been sleeved and you can only shoot 38 special or 38 Long Colt in the gun. 38 Long Colt was the predessesor cartridge to the 38 Special and less powerful. But best of all, it's redily available because it's a ressurected obsolete cartridge now common and loaded by all the Cowboy Action Shooter ammo makers: Black Hills, Ten X and UltraMax. That's what I would shoot in your gun if 38 S&W doesn't fit.

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Jim
S&WCA #819