Rebored/rechambered I think the barrel is fat enough.
The 404 is as good as any other 40 although 400H&H sounds pretty good to me as well.
Brass and bullets would be easier to get.
I wouldn't use a 40 to sharpen my critical thinking skills thats for sure.

And on that note it's time to pour a bunch of H4350 into some 375 brass.

Happy canada day