looking for a scope for a 17 hmr. remington custom shop 547 target. came with two 5 shot targets shot at 100 yd from factory, 5/8 and 1/2 in. barrel moved in stock to atribute to the side to side groups. had glass and piller bedded. want to shoot 100 to 250 yd varmits with it. what power range will work best and reticle?