no, they were a waste of money, once reliable auto rifles were available.
4x at the brain, on a MOVING 6" circle, is a LOT better bet. If you bozos weren't so LAZY, you'd set up such a mover, and KNOW how unlikely it is to get such a hit in 1-2 tries, in that time frame. Buff and bears hit 50 fps, lion's charge at nearly 90 fps. So the 20m charge, even from a standing start, is at most a tad under 2 seconds. You bozos probably couldn't get off ONE good shot in such a time frame, starting from low ready, but a truly good rifleman, with an auto rifle, can get off 3-4 such shots, in such a time frame.