Sorry trying to follow your logic. Not sure what your getting at.8 x 68,
Ibet that with a sub moa 22 with a top notch scope and silencer on it you could shoot 5 bullets through the drinking hole of a soda can.
I bet that with a 223 that shoots an equally tight group you can do the same.
As you might also be able to perform the same surgery with a 7x57 as well.
Where is it that you think you would fall off the cliff? What round & caliber would you start shooting trash can lids?
Oh! No bench rest or sand bags on anything. Any position you want. You can use a bipod.