First, let me introduce myself. IM 48, I live in upstate NY, I love to hunt and fish and just be out doors. Im getting back into bow hunting after 20+ years. IM looking at 3 bows, matthews switchback, bowtech alliance and the hoyt v-tech. OK, heres the deal, I went to two pro shops to shoot a couple of these bows. One guy says IM a 26" draw and the other says IM a 27 or 27.5 draw. I did the measure finger tip to finger tip thing, divited by 2.5, I come up with 27.5 Is there a sure fire way to find out my proper draw?? By the way, IM leaning towards the Hoyt V-Tech.

Well you can stand beside a wall and stick ur arm out straight and put your fist against the wall, now bend your arm slighty as you would hold your bow, have ur guy measure from the wall to the corner of your mouth. Some pro shops measure with your arm straight and that will be wrong, because your bow arm should be slightly bent and relaxed at full draw. Prolly better ways to do it as well, but this is how i was always measured. But keep in mind thats only a starting point, once you get your bow, stay at the pro shop and shoot it and you may have to go up or down 1/2" or so to get it perfect.Psstt go for the BowtechAllegiance.

The shop that I go to use a special arrow that basically has ruler markings on it. He had me draw a really lightweight bow and he would note the draw length indicated by the markings on the arrow. He had me draw about a dozen times. Half with my eyes open and half with them closed.

If you err do it on the short side. In this case I would say go for a bow that is 27", but adjustable with the module. Most bows will draw longer than they are marked so be aware of it and have the bow measured also. Don't take the sticker's word for it. Depending on the quality of the rigging the string and/or cable will creep over time resulting in a slightly longer draw also. How much depends on a combination of string material and quality of workmanship.

As for the wingspan method of determining your length, ask yourself. Do I have longer fingers than most? This can result in a slightly longer bow than you should have. The wingspan method is not perfect, but neither is any other way.
To use a light bow and measured arrow the person drawing it must know something about shooting form and be able to anchor consistently and at the right place. Most people stretch out and anchor too far back and shop personnel don't tell them this. Then there is the idea of drawing the bow with fingers which will not compute ptoperly if he will ultimately be shooting a release. In this case it's normal to reduce the measurement by anywhere from 1/2" to 1".
See, there's a lot to it. That's why I like bows that are adjustable for the shooter. You may get a bow set at a certain draw, shoot it for a while, and decide that it needs adjusted some one way or the other. If you have one that is not adjustable then you're stuck with what you got.
Such bows have their good points, but IMO, should be left for the experienced archers who really know what they are doing.

Is it 26 witha sting loop? That will take about an inch off. What shops are you going to? I am also from Upstate NY well Central. Hoyt V Tec is a great bow. Did ya try the Vipertec?

Take the advice of JeramyK and have them use the premarked arrow and then go from there. Make sure that you let the shop guys know what type of release you want to use or if you will use one at all. That will make a difference. Oh and off the record, I am shooting the VTec. It is the best bow I have used and the more you shoot it the better it gets. Good luck and remember to go with what you like best(shoot everything they will let you)

Take a marked arrow in inches and hold it at your neck.Then stretch out your arms perpendicular to your body and see where your longest finger touches on the shaft. That's your length. By the way I would really consider going for that allegiance. Bowtech's Binary cam system is going to revolutionize the bow market.