all spine charts are for a 28 inch draw
there are many varible's, what length are you drawing, how close to center shot is your bow cut in, if you over draw or under draw it changes things a lot. the center shot is very important, put a arrow in your bow and hold it at arms length, look at the center line of the bow and line the string up in the center of the bow, quickly look at the point end of the arrow, most are 1 3/4 or more pointing out away from the bow, this require's less spine the more this is, a ball park if drawn 28 inch's 0n a 50 pound bow is 45 pound spine will be close, and I mean spined each and every one, not taken out of a bundle that says 45 to 50 pounds in a bundle of 100, this is wood, I spined thousands of arrow's, in a bundle of a 100 of 50 to 55 pound from the factory they would range from 38 to 75 pounds and more
do not buy arrows that are 50 pound if you are drawing 50 pounds at 28 inchs, 45 pounds would be as far as you would want to go, 44 to 45 pounds will be close, if you draw over 28 and under 28 its a very hard, if you leave them full length and only draw 28 inchs it decreases the spine because of the length, if you under draw it increase's the spine, both shoot sloppy.
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