I did similar thing with my AR15. Blew up my upper with bad reloads. Turned upmarket,I've used pistol powder in 5.56 case. Didn't really seem like a much , just bigger bang that usual, but it did destroy BCG and upper receiver was split in half.
I was fine. Lesson learn. Laded thousands of rounds since for rifle and pistols since.
Getting back to 5.7 , I'd like to here some inputs as well,I'm kind of on the limb between 5.7 and .22TCM