What Spine Rating Should I Be Using?
 

I've been bow hunting for 4 seasons now it it's been going great. So far I've put down 2 black bears, 2 white tail deer and a bull moose. I have purchased arrows twice in that time and I'm due for another trip to the Archery section to pick up another box. The first time out, I came home with Gold tip in 340 spine. The last time, I asked the sales guy for advice on arrows and he told me the 340 ones are wrong and he sold me 400 spine. I've had equal success with both. I think the 340's may have been slightly more accurate, or maybe my newbie enthusiasm had me practicing a little more. My bow is set between 60-70 pounds. What does the spine rating affect and what spine should I be shooting?

Draw length and point weigh?

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check with the arrow manufactures suggested arrow spine chart ... that would be best .... arrow length and poundage your shooting at and how heavy of point needed for this chart

draw length is 28 1/2" and I use 100 grain broad heads.

Unless your bow is really slow I'd say 340's are where you should be at, not saying you can't get the job done with 400's, your close to the line for either or imo.

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most manufactures have there own chart you should go by

http://uploads.tapatalk-cdn.com/2016...508c91e263.jpg

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and that chart is for GoldTip arrows the pilot cock, Easton has there own chart and so does carbon express ... its on every box of arrows you buy

:D Pending on what bow...hard cam ...soft cam etc...and your exact weight of bow...

with what you specified

If bow is 65 LB or under...than the .400's will be ok ...on the light side
If bow is 65 LB or over ...than I suggest the .340's

Either under or over 65 LB you can use the .340's as most bowhunters prefer a heavier arrow...

Whereas the .400 will be under spined the higher you go over that 65LB mark

Neil

:D Also arrow calculator on bottom of page with suggested arrow for poundage etc...

http://www.eastonhunting.com/


Neil