The Cancun Open is every year for the past few years and I get invited every year to go. Mexico is a Region in IPSC and I'm assuming they got an exemption to use 380
I was an IPSC Section Co-ordinator (Manitoba) when Jeff Cooper was the World President. I feel -- honestly -- that the more power a pistol generates the more chance the shooter has of ending a deadly aggression that was not sought after or hoped for. If three guys with AK's crash the dinner party you are attending and you are armed and willing to defend yourself, you really need them to be incapacitated when you shoot them. People who spent their whole lives pampered and worrying about storage laws will find that to be a harsh statement, but it goes on all the time in the "real world" and will start here soon enough once only the gangs have guns. Good luck with that, by the way.
To me -- and I know Manuel Evia, I've talked and chatted him up several times over the years -- the idea of getting an exemption for a caliber that isn't adequate for the job is a step in the wrong direction. Still, it's not my call right now, and it's certainly not what I teach when I do teach these days. Shooting IPSC for the sake of shooting IPSC doesn't seem like much fun if the power factor is being thrown out the window -- which it has to be if factory .380 is being allowed.
But again: it's not my call. In Queretero we allow the factory .380 or light loaded Aguila 130 grain .38 Special ammo in NRA Action Pistol matches and PPC matches. For IPSC matches (in Queretero or San Miguel) we have three scoring systems on the cardboard targets: Major caliber (5, 4 and 2) and Minor caliber (5,3, and 1) and Mouse (5, 2 and 1). Steel must fall over. If you have to shoot your .380 factory pistola six times rapidly to down a Popper set to fall for a 125 power factor loading, well that's just tough. It's probably reflecting what happens on the street -- or at the dinner party.
The real-life world of Central Mexico doesn't seem like the place to let such mamby-pamby concepts creep in, but I do know in my heart-of-hearts that it has because I've had competitors argue with me about my "stance" at our Queretero matches. I always reply "Well, if you want to live in a fantasy land just because the Government won't let you have a pistola powerful enough to make real-world minor caliber, do it on your range." Like really, anyone who can register a pistol can build up a .380 Cal and load the 9 mm +P power factor ammo the cartridge generates, they just have to want to. (Aguila "sponsors" a lot of shooters in Central Mexico with 200 rounds a month of Aguila .380 ACP and obviously, the "sponsored" crowd -- referred to as the "tink, tink squad" by the Queretero, SMAGTO shooters because their little guns only go "tink, tink" on the steel without knocking it over -- want to be able to compete equally. Nobody likes being in the "Mouse" category, but hey, it is what it is. And they certainly don't want to power up to .380 Cal and install a locking barrel into their slide because then their freebie Aguila ammo wouldn't cycle, wouldn't even begin to cycle. I mean, it's so wrong, it's just so wrong, why call it IPSC at all, but yes I know it's where things are going.) Cooper washed his hand of IPSC by the mid-'80's I think, but as he commented at the time: IPSC had already proven whatever needed to be proven about the modern technique -- good and bad.
I personally can't wait to get back to the Central Mexican matches. But not everyone agrees with me. They didn't all agree with Cooper either, by the way, but I happened to. When IPSC was setting the power-factor, I lobbied for 180 as "Major"* but Jeff set it at 175 because of the Detonics. Later, after Jeff, the next guy Jean Paul Denis I think lowered it to 170 because 175 was eating up the guns. Fine. But it was the real visible beginning of the fall of the realism in favor of the gamesmen in IPSC.
*In Queretero-San Miguel PPC matches, we occasionally throw a "Big Boy PPC", and specify a Power Factor of 180+ to enter. Now, you can do that out of a stock K-38 loading the 200 grain Lyman bullet up to 900 fps using 2400 powder. If you want. Almost everyone has a remarked .357 registered as a .38 Special anyway, so a Lee 160 grain LSWC loaded to a mild 1,125 fps in .38 Special cases gets you there. That would be equivilent to a 1930's Heavy Duty .38 Special loading. But it makes the PPC a lot more exciting for darned sure.