I'm not an expert by any means, but I since 1973 I have shot whitetail deer with 2,3,4 and 5 blade broadheads. I have had great bloodtrails with all of them and poor to non-existent with all of them. Their are just to many variables to guarantee what kind of bloodtrail you will get every time. Normally, if I hit 'em in the vitals with a sharp, good quality, COC broadhead and get a low exit wound, I will have enough blood on the ground to trail them easily. I would advise you to try several different kinds of broadheads to find the one that flys the best from YOUR set-up that YOU can get the sharpest that gives you a high probability of a total pass-thru dependent on the style of hunting you plan to do. Obviously,if you shoot higher pounds, you are gonna be able to use bigger broadheads than if you shoot lower poundage. When you shoot one and you don't hear them drop or your think your shot wasn't exactly where you wanted it, wait and give'm time. Don't rush it. Get a buddy if possible and take it slow. I mark the trail with toilet paper and also use "chem-lights" (after dark) so I can stay on line. Use the search engine and type in "bloodtrails". You'll find a lots of good info here.