Arrow spine
Contributors to this thread:Equipment
From: KsRancher
11-Sep-19
I keep finding different charts to say different things. I have a 29 inch arrow, Beeman ICS 340's with 100gr brass insert and 125 broadhead. Is the 340's enough spine or should I shoot 300's. 68lbs on a Matthews FX2
From: wildwilderness
11-Sep-19
That's a borderline question. Everything I have heard was if in doubt go with the stiffer spine. With the 100gr insert I would lean toward the 300's...
I shot a 29" 300 axis with 50 gr inserts and 125 tip out of a #69 turbo spyder with good results.
From: x-man
11-Sep-19
I concur with wildwildernest
From: fubar racin
11-Sep-19
I’m shooting 300s with 150 up front I’d assume you would be weak with 225 up front on a 340
From: 0hndycp
11-Sep-19
I’d say you absolutely need the stiffer spine. Although, if broadheads are hitting with field points then I wouldn’t change a thing! Your arrow flight and tuning method will tell you in a couple shots whether you’re adequately spined or not.
From: Buglmin
11-Sep-19
Bare shaft tune and find out what you need.
From: Scooby-doo
11-Sep-19
I would say it will be a tad weak, add a wrap to the back and a lighted nock and it will stiffen thew arrow a bit. Shoot it thru paper at 12 ft and see. Shawn
From: wildwilderness
11-Sep-19
Other option is to cut 1/2" off the back if you can. Add the wrap while at it and 4 vanes and back off to limbs #65 and go with a 100gr tip then you will be fine with the 340s
From: KsRancher
11-Sep-19
Thanks guys. Will work on the tips above. Dont really want to buy new arrows if dont have to.
From: Ambush
11-Sep-19
You didn't mention your draw length. But 340's are no doubt too light spined with that much weight up front. Is it possible to go with a lighter insert?
From: WYelkhunter
15-Sep-19
I think you need 300 for sure. I am 28.5" DL 68.5Lbs . shooting Gold tip velocity with 140 gr tips . I could not get 340 spine to even come close when broadhead tuning. moved to 300 spine and everything was fine.
From: 4blade
15-Sep-19
I shoot 60@29 and use a 29" 300 shaft, 50gr insert, 150gr head but the bow does ibo at 350, which makes a difference. I can get by with a 28.25" 340 if I run a stock insert and 100gr head, its not right but I can do it. If you went with a stock insert and 125gr head it would work.
