I have both 9mm & (2).40 S&W pistols.
I only bought IWB holsters for them in the past and was told by a holster maker that the dimensions are different. I also noticed that some other makers list them separately. Supposedly the .40 is a bit thicker.
Anybody have any input on this?
I'm currently looking OWB holsters, preferably leather.

I also am wondering if all .40s made before the .357 Sig can be converted to .357 Sig?

Yes. The slide is taller and heavier on the .40/357 SIG.

I made separate holsters for mine. There was enough difference.

You should be able to drop a .357 SIG barrel in any .40. Breechface is the same as .40.

quote:

Originally posted by gjgalligan:
I also am wondering if all .40s made before the .357 Sig can be converted to .357 Sig?

I would assume so. It would be interesting to hear of any manufacturer that has made both where conversions could not work.