I bought three boxes of .30/06 GROM for my Sako FN a couple of years back. Never popped anything with them; actually, that rifle has yet to be bloodied, in my hands anyway. That test bullet is impressive, especially at about $16 a box for the ammo!
You shoot a lot of hogs. What do you do with the big old stinkers that aren't suitable for consumption?
I've used that ammo on several pigs, and with the exception of the one in the picture, they've all been one shot, DRT. And I have yet to recover a single bullet. Even at that low velocity, they've all been pass-throughs. Granted, with the exception of one kill, they've all been shot at far less than 100 yards, but the Grom loads have still performed very well. I suppose they're a sort of poor man's Barnes. I've been thinking about pulling the bullets from a box to see how they perform at around 2700 fps, but in all honesty, except for a difference in trajectory, I doubt I'll see any difference at all. They just work the way they are. And like you said, at about $17 per box (for the 7x57), they're really hard to beat. An added bonus is that the brass lasts a long time. It's a win/win.
As for the big boars, I normally just let them go. I know it's bad conservation, since Florida is second only to Texas in having a feral pig problem, but here's the way I look at it. 1) They're breeders. Again, poor varmint control on my part, but they keep us supplied with this 50-75 pounders that I do like to eat. 2) Frankly, they're just too hard to handle (loading, cleaning, etc.). 3)We often have guests out on the property, many of which don't get to hunt very often, so those big boars often wind up being their trophies (they make nice shoulder mounts). 4) This one is important to me: You should see the eyes of a kid when he/she drops a big old boar that easily outweighs them by 250 pounds. That makes for some serious class-room talk on Monday morning, especially with pictures.
So, as I said, I generally just let them walk. I figure that someone will eventually harvest them, not to mention that the fellow who runs the cattle will drop them on sight, regardless of size.
Of the 30+ my BIL and I generally take each year, the vast majority are under 100 pounds, so they all get used (eaten), either by us or by folks we sometimes give the meat to. Considering that in some parts of the country, guns get cleaned and put away at the end of hunting season, having access to these critters 24/7/365 ain't all that bad.