I think the reason for caliber restrictions is because some yahoo went out and tried to hunt deer with something like the 25 ACP or 9mm and did not do so well. The barrel restrictions are more to keep guns like the 92FS from being used as a hunting handgun.

In MD they state you can not use FMJ bullets tracers or a.p. bullets.

some laws are there because some idiot didn't think before doing softening.