Broadhead tuning

[ItsLeo]

After two days of chasing my field points around to no good end, I tried the French tuning method and the results say I'm good to go but I changed nothing to my setup.

After several pms to oktx, he mentioned that it sounded like an overspine reaction. Humm... The arrows Ive been using for my Katera (70# 28" draw) with excellent results are .340 spine cut to 28" w/ tips so I thought they would fill the bill with the bow I'm having difficulty with, a 70# 28" Judge.

Laying in bed, I got to thinking about oktx's overspine (OT2 has the shaft listed as weak for both bows) comment so I find some .400 cut to 29" and head to the garage for some paper tuning. Granted the .400 I had are fletched with 3 5" feathers but that all I have for now. So 1st shot through paper still resulted in a small right tear. So I screwed on a 125gr tip and fired shot two...bullet hole at 7'. Backed up to about 12"... bullet hole. One more shot at around 22'...bullet hole. Hummm outside we go.

1st shot at 15yds...slightly right...adjust sights. 2nd shot center. Back up to 20...dead center. Out to 30...dead center. Time for BH (125gr Thunderhead). 20yds...dead center. Back up to 30yds...dead center.

Beats the heck out of me why the .340 shows on the chart to be weak but shows stiff out of the bow and one that shows grossly weak shoots fine but I'm liking the results so far. Surely it just can't be the difference in fletch???

Arrow charts are just general guides. If broadhead tuning shows the arrows to be over or underspined for you setup then treat them like that. Turn the poundage up or down or change the tip weight to effect the spine. If paper tuning and walk back tuning have proven to me the rest is set up right then I don't touch the rest anymore!

Personally, I use broadhead tuning to fine tune the spine of the arrow only. Going to the 125gr head was exactly what I would have suggested if increasing the draw weight was not an option.

You will probably find you have better longer range accuracy with the heavier heads due to the better spine match and increased FOC.

By the way, feathers weaken the spine of an arrow compared to full size plastic vanes.

[pkee]

I have been having kind of the same problem . I had a new string put on at the end of last Deer season . I did not shoot my bow all summer ( to much fishing ).
A 6 weeks before my hunt the shooting started . Had to rest all the pins . Know my arrows are fishtailing or thay go side ways .
My only arrows that flys stright are the ones with the FOB's on them . I have another hunt in 2 weeks so i dont want to make any changes because i figured how its shooting . After that i am going to take it in to get worked on .
l am thinking i need new arrows . Just cant get them to fly well .
I just need a new Bow

[Nitro1970]

I am very **** about things but sometimes I over think things. I have bowhunted since I was 16 and am now 38 so I have been doing this for some time. If my broadheads are off an inch at 20-25 yards, I never know if it is a tuning problem or just the wind and form affecting the point of impact. I actually really do not worry about it because that small of a difference can be a result of torquing your bow an 1/8 of an inch and so forth...wind...etc. However, I am probably considered in the dark ages because I do not use a peep, shoot with both eyes open, and use feathers instead of vanes. I have always found that using 3 blade broadheads and aligning them with the fletching flies the best for me. Now that is for me, sometimes changing broadheads solves a lot of problems instead of messing with your rest, pins, etc. This is just my 2 cents so take it for what it is worth.

Being off an inch at 20 really dont bother me but as the yardage increased so did the gap...

Here's what I wound up doing last night. I stripped the fletchin from the shafts and gathered up some 100 and 125 gr points and bare shafted through paper at 5yds and at 8yds (no room to go further out) until it shot a clean (as I could get it) hole.

Shot few outside in the dark so I couldn't see the arrows fly but the BH and FT are close at 20 and 30. I'll check it out some more today.

I feel like I hijacked the thread, sorry brother

[txfireguy2003]

No problems with the hijack, I'm learning here, the more oppinions the better.