rofl holy shit i would love a high explosive .22 rimfire for hunting the whistlepigs on my land, that would be spectacular, if only wallmart would carry them i would be in heaven.
I use 50 grain .22 Sierra Blitz bullets reloading for a .222 and a .22-250. They fragment so violently, they're the closest thing to explosive. If you hit a groundhog at decent distance, say over 200 yd., you hear a distinct "pop" when the bullet impacts the varmint. Any closer and you usually don't hear it, at least I can't, because the muzzle blast and sound of impact overlap so closely you just hear one bang. There's no impact sound if you miss and hit the ground.
That's no help for a rimfire, but DUmoTex doesn't want you shooting anything more powerful anyway.
Not that he'd know the difference.