wbond
FWIW Kel-Tec tests their P32 mouegun with Sellier & Bellot FMJ
Many S Americans and Europeans are happy with their 7.65mm Brownings and 9mm Browning Shorts because their governments dont trust them with 9mm Parabellums, not to mention 45acps.
The CZ-83 in 7.65 Browning is a fine weapon. I own one and recommend it to the recoil intollerant. However, it is about the size of a Glock 27. Because (at this point) my government does not fear me, I may own this firearm, and carry it on my person, concealed.
If I should desire a smaller firearm, or perhaps one with a more powerful cartridge, I could purchase and carry the excellent S&W 640.
The handgun is a compromize firearm, in relation to the rifle. The 7.65mm Browning (32acp) is a compromize to the 9mm Parabellum, which is a compromize 45acp, which is a compromize choice to the 44 magnum. The essence of sidearm choice is deciding how much you are willing to compromize. Given that there are a number of handguns comparable in size to your Firestorm that chamber 9mm and 40s&w, the argument for 32acp in that platform size is moot, unless you are restricted by law or life.
If my little argument doesn't sway you, I recommend reading up on the FBI 1986 Miami shootout. I submit to you that if the FBI agents were armed with 32acp handguns, as were many european police officers, the results would have been catastrophic for the FBI.