First time broadhead tuning...Stuck...Pls help

[Ghillie_frog]

So I have been reading as much as possible about how to broad head tune from this site and others and felt I had a good understanding on what to do.
Until....... I got stuck.

My current setup: 29" draw, 65 lbs draw wt, 28in arrow length, 350gr arrow wt, 290fps arrow speed, 100gr broad head, 0.392 arrow spine.

See the picture for where I am stuck. I cannot group the arrows together any tighter than this. FP on the left and BH on the right. If I move the rest in either direction (left or right) from this spot, one of the arrow gets further from POI. My guess to a solution is to either decrease the poundage on my bow or I need a stiffer arrow spine. Thoughts?

[Ghillie_frog]

Seem to be struggling with the picture loading process. I will keep trying. Never mind got it.

[shorthair ptr.]

Well if it was my bow and I had this problem , especially this close to hunting season. I would just adjust the sight for the BH's. I don't know how far you are shooting from to get these impacts but it isn't that bad that if you just want to stay in form using FP's shoot away knowing that you will be 3" left. Practice more shooting the BH's and know they hit where your aiming.

[Mike_W]

Ok so I am not following exactly what you are saying ... You move the rest and that makes the gap between the BH and FP larger?
It's not important where you get a group to shoot but you want your BH and FP together after that you can adjust your sights.

What's you draw length, arrow length, how many pounds are you pulling, what weight of FP and or BH, what arrow spine are you shooting?

Your solution should be (if you are shooting the correct length and spine of arrow) is to move your rest left.

[Ghillie_frog]

Originally Posted by Mike_W

Ok so I am not following exactly what you are saying ... You move the rest and that makes the gap between the BH and FP larger?
It's not important where you get a group to shoot but you want your BH and FP together after that you can adjust your sights.

What's you draw length, arrow length, how many pounds are you pulling, what weight of FP and or BH, what arrow spine are you shooting?

Your solution should be (if you are shooting the correct length and spine of arrow) is to move your rest left.

If I move the rest to the left (away from bow) my BH hits bullseye, but at the same time my FP gets another 1 inch away from the bullseye to the left. If I move the rest to the right then my FP hits bullseye and the BH moves an 1 inch further away from bullseye.

I have all that info listed in my orignal post about the setup except that I was shooting at 20yards.

[winger7mm]

If I understand correctly, you are trying to get your BH to shoot the same as your FP or vise versa. This time of the year, leave the FP at home and shoot your broad heads. The two fly different from each other. Have your bow shooting the broadheads good, dont worry about the feildpoints. Once hunting season is over switch back

[Mike_W]

Originally Posted by Ghillie_frog

If I move the rest to the left (away from bow) my BH hits bullseye, but at the same time my FP gets another 1 inch away from the bullseye to the left. If I move the rest to the right then my FP hits bullseye and the BH moves an 1 inch further away from bullseye.

I have all that info listed in my orignal post about the setup except that I was shooting at 20yards.

Sorry don't know how I missed the arrow info. From that I would guess you are under spined. Try to shoot some 340 spined arrows and see if that improves.

Also have you paper tuned the bow?
This could be worth while as it will make sure your arrow is leaving your bow proper to begin with.

Sometimes broadheads won't hit identical but at 20 yards you should be able to get them very close by tuning, after that you might need to adjust your sights but I would suggest ignoring the advice to just sight in for your field points now.

Having a broadhead on your bow is like having a set of fletching on the front of your arrow. If your bow is out of tune or your spine is incorrect or your form is suffering a broadhead just amplifies and exposes an issue.

Also to confirm you say you move your rest the broadheads will impact your point of aim but your field tips will be an inch further left then they are now?
That sounds like an improvement of a few inches.

I still think it's a spine issue .... Well spine and tuning.

If you are in Calgary go down to Jim bows and get them to check over your bow and at that time paper tune it and look over your form..... I don't know if they have a broadhead target there or not but maybe you could also try a couple 340 arrows to see if weak spine is also an issue.

Good luck
Mike

[Settle&release]

My bet would be arrow spine. Try to stay away from minimum arrow spine on the charts. Original charts are made for bows that are a lot less efficient than today's modern compound bows. I know it sounds kinda redundant but a heavier arrow also has more kinetic energy anyways ( rib splitting power).

[Capone11]

Originally Posted by Ghillie_frog

So I have been reading as much as possible about how to broad head tune from this site and others and felt I had a good understanding on what to do.
Until....... I got stuck.

My current setup: 29" draw, 65 lbs draw wt, 28in arrow length, 350gr arrow wt, 290fps arrow speed, 100gr broad head, 0.392 arrow spine.

See the picture for where I am stuck. I cannot group the arrows together any tighter than this. FP on the left and BH on the right. If I move the rest in either direction (left or right) from this spot, one of the arrow gets further from POI. My guess to a solution is to either decrease the poundage on my bow or I need a stiffer arrow spine. Thoughts?

[IMG]http:/i1345.photobucket.com/albums/p675/Ghillie_Frog/Broadhead%20Tuning/photo_zps4444464a.jpg[/IMG]

Can't see the pic that well but if those arrows say 250 thAts a pretty light weight for 65 pounds your pulling, that could be causing your arrows to fly all over, you should be shooting at least a 300 arrow and make sure you line your broad head up with your fletching.

[petew]

Tuning with 1 arrow groups is not the way to go. Shoot 3 arrow groups and tune from the center of these groups. Shooting 1 arrow FP then 1 arrow BH you have no way of knowing if or what arrow you pulled off. This also shows you the size of a group you are capable of. If you are only capable of a 6" group with FP that is all you can expect with a BH.
Work on the groups, get them to overlap, then move the sight back to the Bullseye.

[3blade]

Paper tune, correct problems.

Walk back tune, correct problems.

Broadhead time, chances are you won't have to correct anything, but this is where different broadheads can change things. As demonstrated by ABB.


Agree probably a spine issue that should have been evident in paper tuning.

[Ghillie_frog]

Thanks for all the suggestions. I think with it being so close to the season start, I will put away the field points and move the rest to where the BH were hitting the center (as some of you suggested). Then walk back tune with the BH to make sure there still on and call it good. Next year I will start this process earlier and likely be getting stiffer spined arrows.