It is my opinion that the slight difference in barrel length that is your situation will not make a difference. You have picked two good defense rounds. Reliability and your ability to shoot them accurately are the overriding factors, not three-quarters of an inch....

My Sig 239 is fairly jumpy chambered in .40 S&W. IT takes a firm ride up and right each time it cycles but is still controllable. It would be more pleasurable to shoot the 9mm in a sub-compact format but that really isn't the point. You'll have much better capacity with the 9mm as the P239 only carries 7+1 rounds. While I've never had reliability issues with the P239 I know the 9mm, generally speaking, chambers more smoothly due to the shorter dimensions of the cartridge.

That said, I stopped carrying the P239 (though it was a comfortable carry piece) and now carry a full-sized, hi-cap 9mm. 18 rounds of 9mm trumps 8 rounds of .40 any day -and that's before a mag change!

Originally Posted by Pistolero

That said, I stopped carrying the P239 (though it was a comfortable carry piece) and now carry a full-sized, hi-cap 9mm. 18 rounds of 9mm trumps 8 rounds of .40 any day -and that's before a mag change!

I have a 239 as well, in 9mm (8+1). Although I could carry it, I don't because it is too large for it's capacity. Therefore, like you, I prefer to carry a few more rounds in the magazine if I'm going to carry something that bulky.

I have the 239 because I like the way it looks more than most other Sigs, and just so that I could have at least one Sig in the safe. I like it a whole lot because it is very accurate and reliable, but I'll never own a holster for it......