Hi guys after a few year lay off I'm getting back into traditional. I am buying a Black widow PSAX 60" 40#@ 28 and I will draw 29, Can any one recommend a carbon arrow size, I'm thinking about using a 125 gr broadhead. I used a spine calculator and it looks like a 500 spine should be good but its only about 10.4 gr per inch. I am afraid this is too light.......Any advice ?
10 grains per inch seems to be the go to for a lot of people. I think a .500 spine will be very stiff,especially with a 125 grain tip. You might try a .600 spine,but I don't know how those are cut on the shelf,the Black Widow shelf cut may work for a .500.
I'm shooting a 500 from a 50# bow so I agree you may need 600. I wouldent guess tho....get a couple shafts in both w different tip weights and do some bare shafting
Tim B
Goin say it agian, get a test kit of arrow sizes and field points. At your draw you're about 42-43#'s on a Widow. A GT 500 spine is in #'s 35-55#'s. Which brings up another point. What's 500 spine for one arrow manufacturer may not be the same for another manufacturer. Ran into this recently.
Don't confuse grains per inch (gpi) and grains per pound (gpp). Grains per inch is what the bare shaft weighs per inch. Grains per pound is the ratio of arrow weight in grains to bow draw weight in pounds.
You'll be drawing about 42# at your 29-inch draw. If you hang about 250 grains on the front of the arrow, you'll end up with an arrow about 520 grains, about 12 plus grains per pound of bow weight and plenty heavy for deer size critters.
With that much weight up front, and the little extra draw length, i.e., 29 inches, the .500s will very likely work.
You can get that weight up front with some combination of insert, adaptor and broadhead weight. For example, with a 125 grain head, can use a 25 grain insert and a 100 grain adaptor, or a 50 grain insert and 75 grain adaptor. BTW, 250 grains up front on a carbon arrow really isn't a lot. Some folks put 300-400 grains up front for extreme FOC.
Out of my bows at that weight range I can shoot either 500 or 600 spine depending on point weight. I would think the 500 spine will work fine. I would buy a few 125, 150, 175 and maybe 200 grain field points and see what tunes best. by adding a little more tip weight as mentioned your arrow will be a little heavier and also have a little more FOC.
I would shoot the .500. Widows are cut past center and that will make a nice heavy hunting arrow and a quiet bow.
1916s or 1820s. Aluminum. Pretty common both sizes and usually can be found at pretty good prices......YMMV
Thanks for all the help. I'll try a few of the suggestions and get back to you
Quote from: valleysniper on February 26, 2019, 08:36:02 PM
Thanks for all the help. I'll try a few of the suggestions and get back to you
Talk to the guys at Black Widow, I bet they would have a real good idea where to start!
.500 or .600 will work. Just depends on the length of the arrow.
All posts were giving you very good advice.
Boils down to actual arrow length and weight up front.
Have fun and enjoy the process of finding the combination that flies best for you.
Regards,
Bill