In case it’s real and not snarky, short barrel revolvers ballistically are like 9mm to 9mm+P.
Here is a chrono and gel test I did before:
https://www.glocktalk.com/threads/jc...sting.1698591/
Gun model number, barrel length and gel penetration distance are listed.
Velocities of the 135gr Gold Dot from a J frame
And from a 3” 686
I’d imagine the 2.5” to come right in the middle of that.