broadheads not grouping?

[HighCountryHunter88]

hey all, i have been shooting a lot this year and i can shoot 5 shot groups touching out to 50yds very consistently but when im trying to switch over to broad heads im getting pretty spastic flight.

if first tried DRT heads and i was having trouble with the heads in the 3 pack shooting differently that the others, one would dip and dive and tail whip ( no matter what arrow it was on) and the other would shoot fine on the same arrows as the previous head.

then i went and got some Shuttle Ts because it seems a lot of people like them, we i cant get them to shoot straight either. they seem to group better way low and right of the field points but they are flying like crap, tail whipping all over the place?

what am i doing wrong? please help!! im no bow tech..

[dreamunelk]

First make sure you have the correct spine for your arrows.  Then I would take it to a pro shop to make sure everything is in tune.  Assuming form is correct something is out of whack.

[HighCountryHunter88]

how do i know know that? i just got my bow back from XXX in june, they set up new strings and set me up with new arrows ect..

[lamrith]

Maybe verify that your broad-heads are lined up with your vanes.  I did this and it helped bigtime.  May not solve everything but will likely help.  Might try checking your FOC as well, if you are low FOC the broad heads can really affect flight.

Beyond that you are looking at maybe going in and having you and the bow paper tuned.

[irishevox]

First make sure you have the correct spine for your arrows.  Then I would take it to a pro shop to make sure everything is in tune.  Assuming form is correct something is out of whack.

Agreed.   Also i would check the grain.  what grain field tips are you using VS the broad head grain.  They should be the same

[HighCountryHunter88]

First make sure you have the correct spine for your arrows.  Then I would take it to a pro shop to make sure everything is in tune.  Assuming form is correct something is out of whack.

Agreed.   Also i would check the grain.  what grain field tips are you using VS the broad head grain.  They should be the same

both 100gr

[sirfunkeybut]

maybe the broadhead is tweaked, try doing a spin test with it?

[pianoman9701]

Paper tune your arrows with the field tips - #1 reason that broadheads plane off for me
Already mentioned/Line up the blades with the veins - #2 reasons for me
Already mentioned/correct spine
Make sure your cams are timed correctly

Other things to check:
Have you changed anything on your bow lately, like the serving, nocks, arrow rest, your release, quiver, etc.?

[BULLBLASTER]

Lining up blades with vanes will have no impqct whatsoever on flight... unless the head just happens to spin true with it lined up. Can you cut the vanes off of a field tip arrow and shoot a group at 15-20 yards with 3 field tips and the field tip with vames cut off? Then post a pic. If the bare shaft groups with fletched arrows you should be good. If not some tuning is needed.

[BULLBLASTER]

I would guess that since xxx set you up your sspine would be good but can you also post specs (draw weight, draw length, arrow length, and arrow brand and spine)?

[lamrith]

Lining up blades with vanes will have no impqct whatsoever on flight... unless the head just happens to spin true with it lined up. Can you cut the vanes off of a field tip arrow and shoot a group at 15-20 yards with 3 field tips and the field tip with vames cut off? Then post a pic. If the bare shaft groups with fletched arrows you should be good. If not some tuning is needed.

I would not believed the lining up myself if it had not worked for me personally but it did.  From 4"@20yards to touching just by lining them up.  Maybe it masks an underlying problem, but it can help.

Great info on the bareshaft tuning!

[HighCountryHunter88]

i believe i may be under spined, im shooting GT expedition hunters 7595, 65lbs, in a matthews switchback, i believe im 29" draw but not 100%

now that i think about it i used to shoot xt hunters 7595 a couple years ago and was told i was under spine. for some reason when i bought these arrows i got the pros and the expeditions backwards.

could this be the issue? i just did some reading just now and there wasnt alot of great things being said about these arrows 

[BULLBLASTER]

Spine should be ok unless your arrows are way long.. One way to check would be to back off the draw weight and see if that helps grouping. Shoot a bare shaft amd let us know the results. Im betting its a tuning issue.

[pianoman9701]

Lining up blades with vanes will have no impqct whatsoever on flight... unless the head just happens to spin true with it lined up. Can you cut the vanes off of a field tip arrow and shoot a group at 15-20 yards with 3 field tips and the field tip with vames cut off? Then post a pic. If the bare shaft groups with fletched arrows you should be good. If not some tuning is needed.

I have absolutely improved grouping on broadheads by aligning the blades with the fletches. 

[HighCountryHunter88]

i will try the bare grouping later, the arrows are 29" from instert to back of arrow between arrow and nock