How to Broadhead Tune?

[540-Virginian]

I tried to find a thread on here but can't seem to narrow down the how, only the why... I'm finding conflicting info on the internet (surprise, surprise) if y'all can help me?

If your broadhead hits RIGHT of your field points in the target, do you move the rest left or right?

Some said move rest LEFT, but with paper tuning, a left fletching tear would have you move rest toward riser. I have seen videos where some say you should move the rest RIGHT instead as the arrow.

I'm actually tuning with my cams (bowtech deadlock - no yokes) as my rest is center shot, so I'll do the opposite of whatever the suggested rest movement is supposed to be (e.g., if it's move rest right, I'll shim cams left - unless I'm mistaken there too). But I can't figure out what the right answer is for this fix...

The spine is not too weak (I lowered lbs to test and was still right). THANKS!

EDITED: I had it mixed up on who said what. Gold Tip method seems to make the most sense. I think it was Dudley who had it backward.

 

[gelton]

If the broadheads are hitting to the right of your field points, move the rest right or the cam left.

There is a ton of misinformation out there due to the Easton tuning guide which was written back before drop away rests.

 

[Billy Goat]

Move your cams to the left for a right broadhead impact.

 

[540-Virginian]

Move your cams to the left for a right broadhead impact.

Thanks - I would have experimented, but I didn't want to lose 10 lbs from sweating for 30 minutes...

 

[Billy Goat]

Thanks - I would have experimented, but I didn't want to lose 10 lbs from sweating for 30 minutes...

I'm doing the exact same thing right now.

 

[92xj]

My simple little brain doesn’t understand how moving the rest to change broadhead point of impact doesn’t move the field point point of impact. My broadheads are hitting 2” to the left and whatever I do the two points of impact just follow each other around with the 2” space between them.

 

[Billy Goat]

My simple little brain doesn’t understand how moving the rest to change broadhead point of impact doesn’t move the field point point of impact. My broadheads are hitting 2” to the left and whatever I do the two points of impact just follow each other around with the 2” space between them.

Have you tried moving your cams? Or altering the lean?

I have had a few that wouldn't seem to come together with rest adjustments, they just stay a certain amount apart.


Is it a carbon riser by chance?

How far are you shooting?

 

[92xj]

Have you tried moving your cams? Or altering the lean?

I have had a few that wouldn't seem to come together with rest adjustments, they just stay a certain amount apart.


Is it a carbon riser by chance?

How far are you shooting?

Prime centergy and my shots for broadhead tuning are at 20 and 40. 20 yards they are just a tick left, 40 they are 2”.

 

[jlaner0408]

My simple little brain doesn’t understand how moving the rest to change broadhead point of impact doesn’t move the field point point of impact. My broadheads are hitting 2” to the left and whatever I do the two points of impact just follow each other around with the 2” space between them.

It will move both, but the broadheads will typically move more than the field points.

So think of it as if your broadheads are hitting 2” further to the right than your field points, upon adjustment the broadheads will move 2” left while it might only move the field points 0.5” or so left. So if you slowly tweak the rest (talking 1/32nd of an inch movements) your groups will work back together.

 

[sndmn11]

I'm actually tuning with my cams (bowtech deadlock - no yokes) as my rest is center shot, so I'll do the opposite of whatever the suggested rest movement is supposed to be (e.g., if it's move rest right, I'll shim cams left - unless I'm mistaken there too). But I can't figure out what the right answer is for this fix...

These are the notes I keep in my phone for playing around with my reckoning so I don't confuse myself.

Counter clockwise moves cam right
Clockwise moves cam left
Move cam toward fletched when shooting bare shafts
Move cam away from fletched when shooting broadheads
Move top cam only to adjust lean or both opposite.

 

[540-Virginian]

These are the notes I keep in my phone for playing around with my reckoning so I don't confuse myself.

Counter clockwise moves cam right
Clockwise moves cam left
Move cam toward fletched when shooting bare shafts
Move cam away from fletched when shooting broadheads
Move top cam only to adjust lean or both opposite.

Wait why the difference in bareshaft vs Broadhead? They tune the same for most part don’t they?

Also, I’ve never heard trying to tune the lean on these cams, should adjust both the same amounts. I may be wrong.

 

[Samdemarais]

Prime centergy and my shots for broadhead tuning are at 20 and 40. 20 yards they are just a tick left, 40 they are 2”.

You may have a stiff spine, prime centergy tends to like a little weaker spine

 

[Samdemarais]

You may have a stiff spine, prime centergy tends to like a little weaker spine

Let me rephrase that, the one prime I have shot and tuned, which is mine, likes a weaker spine.

 

[BullsDeep]

My prime nexus 4 likes a weaker spine when I throw broadheads into the mix. Pulling 63# at 27" draw. Shooting 6 inches to the left at 40 yards with fmjs 340s. I tried to get it tighter groups....threw my victory vaps ss 400s in and it's shooting just like my field points out to 60 yards.

 

[Beendare]

Delete

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[sndmn11]

Wait why the difference in bareshaft vs Broadhead? They tune the same for most part don’t they?

Also, I’ve never heard trying to tune the lean on these cams, should adjust both the same amounts. I may be wrong.

Adjusting both the same is equivalent to moving the rest left and right, the system is intended to make it easy to tune in lean. I found easy and predictable success by moving the top cam 1/3rd turn, testing, top cam another 1/3rd turn the same way as the first adjustment, then bottom 1/3rd turn the opposite way, then bottom 1/3rd turn the opposite way. This keeps the nock point as close to centershot as possible, but is making up for any shooter torque, riser torque, or other abnormal variable by taking the string from I to \. I helped one person do the above, the other three deadlocks, including my own, never got past the top cam being more than 2/3rds turn from the middle.

 

[92xj]

You may have a stiff spine, prime centergy tends to like a little weaker spine

I just went down that rabbit hole and got my paper tuning great.
when I say what I’m shooting everyone will say 300 spine which I had in BE rampage and day sixx. I’m now bullet holes in paper with 350 rampages
70 draw
28.5 dl
28” arrow
Wrap and 4 fletch
50gr insert
25gr collar
150gr head
505 total weight

 

[Samdemarais]

I just went down that rabbit hole and got my paper tuning great.
when I say what I’m shooting everyone will say 300 spine which I had in BE rampage and day sixx. I’m now bullet holes in paper with 350 rampages
70 draw
28.5 dl
28” arrow
Wrap and 4 fletch
50gr insert
25gr collar
150gr head
505 total weight

Ya I am shooting day six 350, 28” 175 up front, 28.5” draw and 65lb. I tried to shoot 300s for a while and could not get rid of the left tear or right impact with broadheads, left handed bow, until I weakened spine.

 

[540-Virginian]

Adjusting both the same is equivalent to moving the rest left and right, the system is intended to make it easy to tune in lean. I found easy and predictable success by moving the top cam 1/3rd turn, testing, top cam another 1/3rd turn the same way as the first adjustment, then bottom 1/3rd turn the opposite way, then bottom 1/3rd turn the opposite way. This keeps the nock point as close to centershot as possible, but is making up for any shooter torque, riser torque, or other abnormal variable by taking the string from I to \. I helped one person do the above, the other three deadlocks, including my own, never got past the top cam being more than 2/3rds turn from the middle.

Weird never heard this, even dealer said move both in same direction… but if it works i guess it works

 

[sndmn11]

Weird never heard this, even dealer said move both in same direction… but if it works i guess it works

Give it a try. The beauty of the deadlock is that you can sharpie some witness marks and make adjustments back and forth in a few seconds.