Good that you got to shoot the .40 converted to .357 Sig. I had .40, 9mm, and .357 Sig barrels for my original .40 cal Sig P226 alum frame pistol and enjoyed shooting the .357 Sig but man it was different from the lightly loaded 9mm I usually shot!
The absolute worst combination is a .40 cal version of a 3" barrel polymer subcompact, like a Kahr PM-40. That is a hand canon. Not fun. Loved the Kahr striker trigger...until the gun went off. I quit shooting it as I got older and less tolerant of discomfort.
Joe