When we lived out in the sticks as a kid I had a dog & a falling block 22 for entertainment,,no other kids within more than a mile. Hard to get 22 ammo but dad would buy bb’s because they were cheap. I wore out a lever cocking BB gun shooting up the bbs 2&3 times each if they stayed round enough. Shooting those old BB guns from the late 60’s taught you how to estimate drop better than any chart.