a plain jane 17 hmr will cost you from 200 to 250, depending on area of the country. I would zero a 22mag, if using 30 grn Aguilas or 33 grn rmmy's at 50 yds. Why so short? because you are not going to shoot squirrels past this distance. Also if you shoot at a larger animal, out to 100 yds., this will allow you to shoot " down the tube" of a 2 inch diameter pipe all the way out to about 125 yds.
lets put it this way; with a 100 yds zero, the bullet will rise 1.5 to 2 inches , above line of site , at 50 yds, and will be about 5 to 7 inches below line of site , at 150 yds. DEPENDING ON THE GRN WEIGHT YOU USE! lower grn weights, get the smaller rise and fall obviously.
As an aside, the 17 hmr will cut these trajectories approximately in half!