A very high velovity small caliber round using hollow point bullets would provide accuracy and the bullet itself would self destruct when it hits anything.
I've heard tales of bullets exploding on contact with blades of grass, water droplets, grasshoppers, twigs, etc. I had an experience years ago with my 22-250 which was handloaded nearly to the max. We had part of an old house on the farm that remained after we moved the new one in. It had sat on an remote location on the property. After listening to all those tales I thought it would make a great backstop for some target practice. I placed the target on the outside wooden siding, backed off a hundred yards and commenced to practice (I mean sight in my scope) yeah right. /w3tcompact/icons/smile.gif Anyway after shooting about twenty rounds I checked the tartget, good placement. Then for some reason I went in /w3tcompact/icons/shocked.gif , the bullets had missed the wall studs, penetrated the siding, plaster lathes, plaster, hit the exterior wall entering the plaster (some were keyholed), plaster lathes, plaster and after going around to the back of the old house I found that all had exited. /w3tcompact/icons/blush.gif /w3tcompact/icons/shocked.gif /w3tcompact/icons/shocked.gif This was lead tipped not armour peircing. Moral of the story is that I no longer believe in the "blowup" theory. I'm sure deflection is a much better explanation. Just a word of caution to all sportsman, make sure the "backstop" will do the intended.
I'm sure the 17 rem. will penetrate much more than most think!
Better safe than sorry.
Jim