With the PA season only weeks away, I am having a major problem and would appreciate anybody's help and advise.
I am shooting my 100 grain target points with (for me) great accuracy..
3 " groups at 20 yds, and 5 " groups at 30 yds.
I even switched to the target points that are elongated and mimick the general shape of the expandable broadhead.
I also got the bow (High Country Carbon) fully tuned up at the local Gander Mt. store.
Last wekend I finally got a broadhead target and screwed on one of the three new NAP Spitfire 100 expandable broadheads, expecting similar groupings..
No such luck..
The spitfire shoots all over the place, at 20 yards one shot gos 8 " left, the next 4 inches down and the next in the bull.
I thought that expandables prevented this type of variance.
Could it be that one of the three blades is actually opening at the shot and that this blade is throwing off the arrow flight.
Any thoughts..
I guess at this point I should throw out the target points and only shoot broadheads (although this can get expensive).

That's odd for expandables to shoot badly. Have you spun tested them? I'm wondering if you got a bad pack that has bend ferrules on the broadheads. This could mess things up for you. Having the blades open during flight might do it too, but why are they opening? Tie the blades shut with dental floss to make sure they stay closed and see if it gets any better.
My first guess would be that the heads aren't straight.

peashooter

What you are saying makes no sense. Are you sure you are shooting the same weight og broadhead as you are exspandable? And when did you start shooting? You sound new. Not a problem, but you owe it to the sport and your quarry to be capable before taking a shot at a live animal.3" @ 20 yds is actually marginal accuracy to me at least.

By the way I know I expandable is spelled wrong.

My guess would be the blades are opening in flight. The spitfires are only good for a few shots then the you need to replace the blade retainers. Tie them shut with dental floss as was suggested. I bet this will cure your problem.

I have shot spitfires in an open position on purpose , with no problems, from 2 bows. I believe you need to check arrow spine and bow tune.

When you say you had your bow tuned at the local Gander Mountain, do you mean you let them tune it themselves?

Or were you there with them shooting it through paper and stuff?

FIRST MISTAKE.. Gander Mountain Techs.. I bought arrows from them and told them I wanted them cut 27.5 inches... FIrst question he asked was, is that from the tip of the nock for the groove.. I said 27.5 inches the way an arrow is supposed to be measure.. From the GROOVE..

Well I get home and they are almost 28 inches...


So needless to say.. I dont trust those guys...

Big John - all three blades open - or did you try opening just one ?

Don't get me wrong, I'm not challenging you, but it seems like having just one open would upset the flight.

I too have NAP SpitFire 100's, and I haven't had a problem. As dumb as it sounds, I'd think the likely cause would be practicing with 85 grain field points and then switching to 100 grain expandables or something like that.

How are they hitting ? I mean, are they consistently low, high or off to one side or the other, or are they more or less erratic ?

Did you change anything besides the tips (ie: draw weight, length, rest, etc.) ?

You're asking for opinions so here's mine. It's an arrow spine issue.

iam kind of lost here myself i have shot mech boardheads out of un tuned set up and they shot great only time i have ever had mech broadhead problem is blade opening prematurely. hope you get it worked out.