That's great, then you're good to go. I've slugged a lot of barrels over the years, and they vary in size, depending on how new the reamer was the factory used on them. I've found .38 barrels that were .356" in diameter (a Colt Python) and 9x19 barrels as large as .359" (a Browning Hi-Power). The standard SAAMI groove diameter of the .38 Special barrel is .355", and the bore diameter is .346", which is why some folks are able to use 9x19 and .38 bullets interchangeably.
The important factor in revolver accuracy is the chamber mouths in the cylinder, or throats. If they're consistent, the revolver will have a tendency to shoot more accurately, if the bullets are sized to the throats, rather than the barrel. I know this is off topic, but I threw it in just to let you know that even if those bullets were meant for 9x19 or .38 Super, they might also work well for .38 Special.
Load them up and enjoy.
Hope this helps.
Fred