A statement, if such exists, would be helpful. I can't see the fragmentation rational being taken seriously. First, far too many modern cartridges are permitted that don't fragment easily at 300 yards (like the 264 Win Mag). Second, a lot of ground hog shooting, using modern fast cartridges, is done at shallow angles, some using a bipod or rest. An accidental discharge at 10 degrees above horizontal is going to go for a very long way. Also, I hear fellows bragging about chucks they've nailed at 400 yards. At 400 yards, a 22-250 is only chugging along at 1,832 fps (Winchester 55 grain factory load). Whether it will fragment when it has slowed down that much I don't know ... maybe the rotational speed is still fast enough to do it .... Third, muzzle loaders and shotgun slugs don't fragment and we don't seem to have heavy pieces of lead bouncing all over the countryside during deer season.
The old, slow bullets out of black powder cartridges don't bounce as far as a 270 that skips off of a hard clay alfalfa field in August. On our farm in Manitoba, where the next farm was more than 5 miles away, I skipped slow heavy bullets off the ground to see how far they went (we had a 2,000 acre farm where the fields were very large and the terrain was very flat). I could keep track of the bounces by the puffs of dirt and, after the first touch down, I never saw a bullet bounce more than 4 times. The last bounce was always less than 300 yards from the first bounce. My 303 British, on the other hand went so far after the first bounce that I never saw the second one, just heard the whine as it headed for the next hayfield. (I always made sure that the direction I shot in had no farms within 5 miles, and I was a teenager in the early 70's on the prairie. I don't do this anymore.)
Anyway, that certainly is not going to persuade any committee, but I hope they make their decisions based hard data if they are concerned about bouncing, not to mention probabilities. The fragmentation criteria would also rule out the .22 rimfire.
I don't think current law permits full metal jacketed bullets for hunting. I only shoot cast bullets out of ancient guns, so I haven't checked it for sure, but I know they were forbidden in Manitoba in the 70's.
I don't want to start the Spanish Inquisition here, I would just like to be able to use the .32-20 loaded with black powder for ground hogs at 50 yards. You'all have raised a number of points worth pondering.