10mm is the best choice in caliber for a powerful semi auto handgun. It's for when you need or want more than a 9mm/40/45 and a large magnum semi auto or revolver is not practical. It offers decent ballistics and high capacity. It just makes a lot of sense.

I've experienced the same thing with Hornady loaded 180 great XTP. Indoors it produces pretty big flash, much like power pistol handloads.

This is my carry load and I am considering finding a new load because of it.