chicharrones
needs more ammo
If you want to sell a whole bunch of handguns to the general public, you chamber them in 22lr, 38/357, 380, 9mm, 45acp... maybe 40 caliber.
IMHO, this would be "better" in 25acp or 32acp, but that's not going to sell tons and tons of guns, so that's not what it's chambered in.
Now if only Ruger was an Austrian company* and intended to sell a ton of LCP IIs in Europe . . . 7,65 Browning would have probably been the first chambering.
*blasphemy!