This all reminds me of a telephone conversation I had with JD Jones of Handgun Hunting fame. He told of trying to convince the Ohio wildlife agency to legalize handgun hunting. (At that time, you couldn't hunt BG with a handgun in Ohio. Don't know what the deal is now.) The wildlife guys were worried about the outlaw class going out in the woods with their .25's and .32's, and .38 snubbies, and wounding loads of deer. Mr. Jones hypothesized that in the extremely rare event that a gang-banger got within 100 yards of a deer, the odds of him wounding the critter with the straight arm, 90 degree cant, poke and jerk shooting typical of the genre were extremely low. Less than the honest wounding stats for bow hunters, and, (my opinion here, not Mr. Jones') certainly much less than the wounding rate for rifle shooters.
I think the same for rifle calibers. Writing regulations so some dummy doesn't buy a box of 45 grain varmint loads and wound a deer or three is a fool's work. The dummy probably won't wound many critters, as he probably won't hit many. By the time the said individual de-dummys, learns a bit about terminal bullet performance, maybe just a tiny bit about BG anatomy, and field shooting, his lethality will match or exceed any other dummy who buys a .300 Super Whammy Extra Flat, Short, Fat, Magical Killing Special, in a 4 pound Mountain Rifle, and who then proceeds to unleash said .300 SWEFSFMKS at ranges requiring satellite survey techniques to measure. Fortunately, the dude with the .300 mostly misses cleanly, as it is hard to know your bullet drop at 800yards when you sight in at 100 yards, standing.
The seeming lack of concern or embarassment displayed by the hosts of TV hunting shows and videos as they blast round after round at distant running game says it all.