150m is a looong way out for a 22, I've taken rabbits and hares out to about 120m with subs and that was aiming about top of the ears to hit them in the chest - in one case a foot out the side for wind as well (trial and error got that one, lucky it couldn't hear me). Just get plenty of practice and gradually push the distance out as you can.
Good work on the restoration, I'm sure it will turn out much nicer than original.
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