I want to pick up my first set of woodies tomorrow for my super shrew. It is about 54# at my 29" draw and .450 spined carbons shoot best out of it right now with a 92 grain insert and 175 grain points. I like a heavy head so how heavy of a spine do I need to go with woodies? I searched the forum but found most responses directing people to vendors. I work at an archery store and we have some decent poc shafts but most everyone else in the shop shoots strictly compound so I don't have much help with trad stuff. Thanks
Just a guess, but based on my 57# at 30" draw with 125 gr heads and using 70-75# shafts for that you will need at least a similar spine. Release and other factors may call for 5# more.
54# plus 10# for 175 gr heads (5# for every 25gr over 125) plus 5 for 29" draw (5# for every inch over 28") = 70#
So 70-75# spine.
Best bet is to get a range of trial shafts or arrows from an outfit like Rose City. Centershot can lower spine needed as can a smoother than normal release.
Thank you so much, really good info that will start me out
Tom,For your info,the Griffin you have coming(Hope to god soon!)My draw is right on 27-1/2",and the bow was just shy of 55#.Iwas shooting 60-65# spine POC,total arrow weight 525 gr. arrow length,from nock throat to back of piont is 28" and 160 gr. target piont.They shot like darts,5-1/4" shield RW feathers.
I was also shooting 65-70# Sp. Surewoods Douglas Fir,same length,same feathers same target piont,total arrow weight 620 gr. they flew great.
Contact "snag" or "Fletcher" on here and get you a test kit made up not only for this bow, but for any bow in the future. My Shrews are 50 and 55 @ 28 and I shoot 60-65 that are cut to 29" and shoot 160 points. All my future arrows will be 65-70 cause my 60-65's almost wound up too short by the time they were stiff enough. A good rule of thumb that was given to me by Ron LaClair himself is 15lbs over what the bow is marked. As the advice given to you above by others..... I would go with 70-75 and build a test kit around that weight, a little under and little over. JMHO..... :coffee:
1) Start at 15# over draw weight as suggested by Ron LaClair
2) Add 5# for 1" over standard draw (standard is 28" draw and 29" BOP arrow)
3) Add 5# for every 25 grains over a standard 125 grain point. Therefore if you're shooting 175 grains your 50 grains over, so 2x5 equals 10# more in spine.
This is my method of getting close and I'll usually round down, ie if the calculation says to add 30#, I'd use an 80-85 pound spine (30+54=84)
Start at 15# over draw weight------Over what is marked on bow ? or 15# over weight at your draw ?
Draw Weight....
At your draw....
Ray's probably right, he's tuned a Shrew or 2.
Eric
QuoteOriginally posted by WESTBROOK:
Ray's probably right, he's tuned a Shrew or 2.
Eric
:bigsmyl: Yeah, probably more than a couple.
It's really about starting points though and everyone can have variations in style that may cause them to go up or down a spine group. I can shoot a Easton Axis 600 cut to 29" BOP with 75 grain brass insert and 145 grain head like a lazer beam even though some would say that's 500 size territory. I can get a 500 to fly the same cut at 29.5" BOP, 75 grain brass and 230 grain broadhead from the same 44#@28 inch foam/carbon 56" Super Shrew Classic Hunter. For wood arrows from that bow I shoot 55-60 pound spine shafts cut to 29" BOP and 125 grain heads.