Lucky your friend is ok and this is a good example of why you should wear shooting glasses. Looks like Ruger built the rifle right. Explosion directed down into the mag well and out the sides.
Had a slight argument with a know it all at the house yesterday. He stopped by and informed me about casting, loading (insisted you could buy ammo cheaper than reloading it) and was appalled I had a single stage press. I just had to get a dillon and he had two of them. Tried to tell him I wasn't interested, was not in a rush loading ammo, didn't load enough rounds to make it cost effective and besides I liked dubbing around one round at a time as I was not in a hurry. Can't say in 15yrs or so that I've misloaded a round either under or over yet and hope I don't.
Like Willie Pete I put them upside down until powder then turn them over. I usually weigh each charge and if using the lyman 55 every 5th or 6th. I load on the bottom end so even if the lyman throws a 1/2 grain off it will still be well under max. If I decide to load 3/4 of max or up for some reason every charge gets weighed.