This just intended to be a friendly comment. There is nothing wrong with using 2400 in a 2 1/2" gun, but watch for unburned powder granules. 2400 seems to perform better in longer barrels. Try a medium burning powder for short barrels.

I once bought a bag of .357 Magnum ammo from a dealer at a gunshow. I knew the guy and trusted him a little. The ammo he sold was a large charge of Win. 231....just a tad too fast for heavy .357 loads. The flash and bang was pretty attention grabbing!

Load your short barrel ammo with a powder somewhere in between 231 and 2400.

Also, I have observed different revolvers will handle the same load very differently. If the revolver has loose chambers, that can cause setback like you experienced.

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Bob.
SWCA 1821