Not staff, but I want to address something on bullets:
Why the hell is it such a big deal if guns become 10-A?
Bullets are lethal not because of their kinetic energy, but because they exploit the mechanics of "pressure".
Hell, even .22 LR can easily cause fatal injuries was was even used for assassinations before by the military, and the .22 LR only reaches between ~130 to 200 joules; 10-A to barely 10-A+
Also, other .22" calibers such as .22 Long, and .22 Short can still cause serious injury to humans, and these are typically only in the 60 Joule range...not even 10-B+, and can still be deadly to humans.
The point is: bullets don't kill from energy, but because they exploit the living hell out of pressure. It shouldn't matter what tier they are, especially since bullets can sometimes take down much larger targets.
For example: A .44 Magnum is capable of taking down a grizzly bear, which a .44 Mag only reaches upwards of 1,000 joules; a value a grizzly bear is vastly above. Hell, there was a report that a 9mm killed a grizzly bear as well...sure the bear endured the initial hit, but it was found dead the very next day.