How important is it that two blade broadheads be timed?

[ultrastealth]

I just started shooting Dirt Nap broadheads, and no two arrows hit in the same spot. These are very good shafts with a good helical fletching. Now, they are accurate with the same arrow, but I need a quiver full of arrows that all hit in the same location. Is it the rotational timing in relation to the fletching that's the problem?

[bowhuntntxn]

No. There should be no need or way to index a 2 blade BH with three vanes. I would start with spine of the arrow and poundage of the bow. Does any other Fixed blade BH give you the same issues?

[ultrastealth]

No. There should be no need or way to index a 2 blade BH with three vanes. I would start with spine of the arrow and poundage of the bow. Does any other Fixed blade BH give you the same issues?

I know that the spine is good, because any one shaft is accurate, they just don't hit in the same place. I was shooting Ramcats at the same weight and had no problem with them.

[Pushbutton2]

No. There should be no need or way to index a 2 blade BH with three vanes. I would start with spine of the arrow and poundage of the bow. Does any other Fixed blade BH give you the same issues?

When I switched from Mechanical to 2 blade I indexed my 2 blades to my shaft.
When they built them they put the insert on the broadhead before gluing it in place.

They told me I don't need to. But I did WANT them too and they did.

I've never done any testing

[Rat]

Do they string out vertically or horizontally?

[ultrastealth]

Do they string out vertically or horizontally?

Both

[Mudslinger]

Make sure the broadheads spin absolutely true on each shaft.

[Traildust]

https://www.amazon.com/Arrow-POINT-BROADHEAD-LOCK-WASHERS/dp/B0072X0QPM

[Geezy Rider]

Are they the single bevel or the double bevel?

[Goldeneagle]

True story: I took the instructor course for the BSA years ago. The guy teaching the course pulled out some broadheads kind of for show and tell. He told everyone that NOBODY shoots 2 blades because if they are not perfectly straight, they will circle around back at you. I told him to hang on for a minute and ran out to my truck and brought my quiver back. It was 6 arrows with Magnus 2 blades on em. Told him they fly just fine. The guy was an idiot.

[Rat]

Both

If there is no discernible horizontal or vertical stringing then it is most likely a form/torque/grip problem.

But...

Like Mudslinger said, check for wobble of the broadheads and then check nock fit. When the arrow is nocked you should be able to spin the string without moving the nock and it should release easily. If the nock fit is too tight it will cause the group to open up a bit like you are describing.

Cut on contact heads are very particular to grip pressure; an inconsistent grip will cause the group to open up as well.

If you are shooting a fall away rest you can try indexing the nock of the arrow; just rotate an 1/8th of a turn until it hits behind the pin. Do this for every arrow.

[SaltwaterSlick]

First thing to do is a spin test on the arrows. make sure the broadheads are on the shaft perfectly straight. When I shot 2 blade heads, I indexed them with the blades vertical thinking the oscillation is more likely to be left/right, but back then I was shooting trad gear and fingers. When I switched over to a wheelie bow and shot Zwicky heads. I straight fletched my arras. If your bow is properly tuned you don't much helix if any to stabilize your arrow. I bet a spin test will show you your problem. If they don't spin true, you can use a broadhead wrench and put a bend in them to line up the head if it's not too bad.

[Goldeneagle]

First thing to do is a spin test on the arrows. make sure the broadheads are on the shaft perfectly straight. When I shot 2 blade heads, I indexed them with the blades vertical thinking the oscillation is more likely to be left/right, but back then I was shooting trad gear and fingers. When I switched over to a wheelie bow and shot Zwicky heads. I straight fletched my arras. If your bow is properly tuned you don't much helix if any to stabilize your arrow. I bet a spin test will show you your problem. If they don't spin true, you can use a broadhead wrench and put a bend in them to line up the head if it's not too bad.

I used to use an arrow straightener with a dial indicator. Check from side to side.

[ultrastealth]

OK, if there was a hand torque issue, it would show up with poor accuracy even when shooting the same shaft, and it is only shaft to shaft. I cut and fletch my own arrows, I square the shafts and the inserts, and I spin check all broadheads. Like I said, Ramcats fly fine, it's just the Dirt Naps. That's why I'm thinking that it is an issue with two vs. three blade heads.

[Rat]

OK, if there was a hand torque issue, it would show up with poor accuracy even when shooting the same shaft, and it is only shaft to shaft. I cut and fletch my own arrows, I square the shafts and the inserts, and I spin check all broadheads. Like I said, Ramcats fly fine, it's just the Dirt Naps. That's why I'm thinking that it is an issue with two vs. three blade heads.

It is something else, if all is right two blade and three blade will hit the same; big two blade heads are more critical to everything though.