If the gun locks up tight, and the overall condition & timing is good, there is no reason you can't shoot it with factory loaded .38 S&W ammo.
As already noted by contenderman, .38 S&W ammo is loaded to very low pressure / velocity in difference to the zillions of lesser quality guns still around.
The S&W is the Cadillac of top-break revolvers of the caliber, and is stronger then most.
On the otherhand, if you break it shooting it, you won't find spare parts at WallyWorld, or anywhere else for that matter!
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