Re: ? Target Sizes for different Distances ?
only thing i can imput is to visit the NRA site for the type of targets / sizes they use in their rimfire competitions, that is if you want to mimic what is done by the shooting sports.
otherwise, a life size woodchuck, squirrel, rabbit, coyote or an idpa target would do fine for realistic sized game.
watching the biathilon, they use silver dollar sized targets at 164 ft. (54 yards).
maybe make up your own "ratios" based on distance
maybe even make them all the same size, and make a "out of bounds" circle. any hits outside of that don't count.
if it gets to be common place of constant hits "in bounds", you can always trim them down a bit.
we were shooting 3.5" at 100 here in our monthly rimfire matches, but got almost automatic 25 of 25 so we went to 2.5" which is offering more of a challenge.