Yes, you shot over-the-counter ammo, which is almost universally loaded to 40S&W pressures. Part of this is because Bren Tens are still out there and are susceptible to slide cracking from shooting heavy loads; part of this is because the FBI Wound Ballistics Laboratory told us that velocity/energy don't matter - only penetration and expansion; and lastly, I think it's CHEAPER for the companies to produce (and then sell at a higher price).
I think for your 45 to 10mm conversion, you should AVOID DoubleTap and Buffalo Bore ammo. As 527Varmint pointed out, there are some sacrifices/compromises you've made by getting the conversion barrel. They are described in the article at this link: