Well personally I am not a good judge of distance so I got a Bushnell lasor range finder when they first came out; Iuse different colored florescent ribbon to mark 15 and 25 yds. Also I learned by accidenttaht if you place your shot so the broadhead cuts off all the arteries just above the heart they rarly make 40 yds,the last time I missed or had to trail one very far was 25 years ago and I just took my 109th deer with a bow of one kind or another last Friday morningso far this year thats 4 with a long bow and 1 with a cross bow. Lee