Broadheadtuning !?

Hi everybody,

i know there's a lot to read about BH-tuning, but, i'm sorry, i yet have to ask for 'help'.

I shoot a Reezen7.0 at ~68lb (one turn backed out). I have an QAD ultra rest and use the Easton A/C/C pro hunting arrows. They are 300spined (a bit 'overspined') and fletched with 4'' Vanes. I use 125gr. FPs and 125gr. Muzzys ( 3 blade).

Currently i don't get the Muzzys impact at the same spot where the FPs do. I already checked all things which are recommended. ATA, brace hight, timing, wheel lean all seems to be fine or 'dead on'. I think the centershot hast to be fine too. I did a 'walk back' and from 10 to 40yd all arrows hit almost the line i put on the target. Papertuning shows nice holes too. The BHs are well aligned to the shaft.

But when i shoot the Muzzys, what i always do with five identical arrows, they impact to the left in a quite spreaded group. They impact with a high or low difference of about 4'' maximum and a difference of about 8'' from left to right, shot at 20yd. Before i checked and corrected the centershot they even impacted to the left and the right compared to the FPs.

At the moment i'm a bit confused. When i move the rest, the BHs will move too, but the grouping is still bad.

So ? What to do next ? May i use a less spined arrow ?

Thanks in advance.
flifla

 

What's your draw-length and arrow length??? A .300 spine in a 68# Reezen would only be slightly over-spined with a 125gr tip on it in many set-ups and should be easily tuned.

 

Hi,

28,5'' is my draw lenght. The arrows are 29''.

What i wonder is, when i move the rest slightly to get the BHs hit the right spot, my FPs go immediately off, too.
I often read about the fact, that the FPs are more or less not effected by movieng the rest (slightly). Or do i get something wrong ?

Thanks!

flifla

 

You could be torquing.... Minor rest adjustments don't generally result in much FP movement. Are you using an OPEN HAND style grip???

 

Have you only shot the BHs at 20 yards ?

If you can do it safe, move back in 5 yards increments and see what happens. A lot can change in 5 yards, if the arrow isn't flying correctly; this process can tell you a lot about your set-up.

Are the arrows sticking straight out of the target ? Are the angled, ate all ? What kind of release ?

 

Hi,

@OHbowhntr: i do not exactly know what you mean with 'OPEN HAND' - but i keep my hand open/relaxed when holding at full draw. Means, i do not put my fingers around the bows grip .... (not closing my hand)

@DropTine249: the arrows stick straight. No angle. Thats the same as the FPs do. I use a scott sabertooth.
I shot them at 30 yards, too. But that was before correcting centershot. At that time they impacted all to the right, compared to FPs. Also a quite 'spreaded' group.

That's a group shot at ~30 yards: http://www.abload.de/image.php?img=p1020566ymch.jpg

To be honest, it may be that my shooting-form isn't perfekt. But i can always reproduce easily that kind of 'erratic' BH flight.

Thanks!

flifla

 

Hi,

another detail i wonder a little: when i did the walk back and corrected the position of my rest, all the arrows hit the line. To get the arrows 'in line' i had to move the rest towards the riser. But now, there is almost no space between riser an the vane nearest to it. There is no much space left. If i would shoot 'higher/bigger' vanes than my normal 4'' vanes, they (the one) would have contact to the riser. Is that normal ?

flifla

 

Hi,

no more ideas ? ... or did a write something wrong ?

flifla

 

this happend to me no my monster and i had no idea what whas going on....
Got a z7 now and havnt had to worry about it...i guess i did somthing wrong on the monster and somthing right on my z7 lol
get some montecs and you will hit where your fps hit =]

 

Hey,

now it works.
I checked all settings of the bow again. I 're-twisted' the cable and the yokes and the string. But to be honest: i did not see any major changes .... but now the BHs fly well.
Now i can shoot the 125gr. Muzzys on the A/C/Cs at 40yards to a reasonable group.

Thanks to all who tried to help me !

flifla

 

Not sure if you've read this or not but here is a guide that is worth it's weight in gold for the serious archery. Hope it helps! http://www.eastonarchery.com/pdf/tuning_guide.pdf

 

Hi,

i know that guide. I have already printed it and put it into my 'knowledge file'. What i tried to say was, that i didn't see that big change on my bow after re-adjusting it, compared to before.
I believe now, that the most important thing to do is a 'walk back'. But a 'walk back' from 10 to at least 70 yards. Then the centering should be fine. What's left is a little correction in nocking point hight. Finished.

flifla