bet you werent shooting animals at range with rainbow like trajectories though........ subsonic centrefire is like .22lr get as close as you can then 5 yards closer.... I dont use a rangefinder either and even at below 75 yards have had enough stuff ups with subsonics trying to headshoot that Ive put a bit more powder in to give a little more room for error and a little less of projectile droop. 30 yards is easy...60 yards not so much.
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