You’re not far off, and you may choose to keep that zero. A 40 GR bullet from a rifle barrel drops about 2 inches at 100 yards. I sight in 1 inch high at 100 yards, but figure it’s only good out to 125. Drop is 8 or 9 inches at 150 yards, and the bullet is starting to lose energy rapidly. 22 mag is a fine choice for varmints that are bigger than bunnies & squirrels but smaller than coyotes. Some of these offer mighty small head shot targets, so center of mass is a better choice starting around 60 yards.