Learning:
MAC
TNoutdoors9 (hasn't put videos up in forever, but probably the best ballistic tests on the tubez)
warrior poet society
Paul Harril
The gun collective for industry news
for entertainment:
Demo Ranch
MAC (double duty)
Kentucky ballistics
neverenuffammo
I really like Forgotten Weapons, and InRangeTV. If you are into classic, and sometimes quirky firearms, then check them out. A lot of history and knowledge between those guys there. Also, Ian from Forgotten Weapons went to Purdue. I did not go to Purdue, but I like to support people from my home state.