I currently shoot ACC 3-49/390s @ 27.5"-28" (mixed batch don't ask :D ). I show SLIGHT weak spine signs when broadhead tuning. I'm fine with field points, but I'm about an inch off in impact at 30yd with BHs. My inserts were not hot melted, so I can't remove the inserts and cut the shaft down .25" or so that I would need to remedy this. Now, I'm fine with the setup I have, and I usually just adjust my windage ever so slightly once I just shooting broadheads again before the season. Well, I'm starting to run a bit low on the ACCs (I still catch myself creeping every now and then, and send one into the woods:d ). I have plenty to serve as my hunting arrows, so this is my question. I have no intentions of hunting with any other shaft, so do I go buy the same spine shaft cut to the same length, and continue to deal with the spine issue? If I buy the same spine and cut down in size, my current arrows won't fly the same once my bow is tuned for the new sized arrows (same goes if I move up in spine). I suppose what I'm saying is, I don't want to make my current ACCs unusable if at all possible, but I feel if I'm going to get new arrows (I may not get a whole new dozen), I should do it right and get everything setup right, but then I will have 10 ACCs I can no longer use (if I have the shaft cut behind the insert, they're going to be to short, so I have no way to remove the insert to cut them down). So, thoughts?
Someone with AA or OT2 want to check to see if I would be better off with 3-49/390s at 27.25" or what size I would need if I went with 3-60/340, would I want it at 28"? According to Easton's chart, I should be shooting a 3-49s, but it's definitely showing weak spine, so I'm not sure they arrow size recommendations are even right. Anyways, here's my setup: 101st Airborne 58-61lbs (I vary for target and hunting) 28.5" DL Currently shooting 3-49/390s @ 27.5"-28" 365gr final arrow weight
I shoot a 100gr head. Not sure I want to go much lower. My FOC is already (I'm guessing here) borderline acceptable.
Matt, I've been shooting ACC's 3-49 cut to 27" out of 68-70lb bows for over 10 years without issue. I'm surprised you seeing a slight weak spine as I too shoot 28.5" both from my previous Hoyts and my current Bowtechs. I've grouped Muzzy's with field points as well as some other heads. If your looking to switch, what do you want for the 10 ACC's?
That's what I was saying. It doesn't make sense. We're shooting the same bows, but you're shooting 8-10lbs heavier DW than me. For the life of me, I couldn't get the broadheads to hit at the same point as fieldpoints. With the limbs maxed out, I was shooting about 2" left of my field points (remember I'm left handed so that's a sign of weak spine). Backing the limb bolts out a ways brought the broadheads in closer, but I never backed off enough to get it perfect simply because I don't want to shoot TOO light of a DW, as it starts to get a little awkward. Any other idea of what it might be, and I'm all ears. Jeff, I know what you're saying to an extent. My only deer shot with this current setup, I had a clean pass through and a very dead deer. My turkey didn't fair to well either:d
Can you take the nock out and cut that end? You may have to refletch but its cheaper thqn buying new arrows.
How long does a uni-bushing sit inside the shaft? Those won't come out either, so I would have to cut after them.
You actually can do that (cut out the unibushing for the G nock) and then use the next nock size. I forget the size at the moment but I'm sure someone will answer. One of the lighted nock companies makes a nock that will fit in an ACC without the unibushing. I forget that one too. Hell sue me, I had a couple beers while working all day on my man room. :d
Likely longer than a .25". You may have to give Rob/PA's idea some serious thought. I put in bushings with just a tiny dab of hot melt glue. It is enough to hold them in but not enough to prevent me from taking them out, if I need too.
Yeah, I didn't build these arrows, otherwise I would have used hot melt. However, that still doesn't explain why Rob can shot the EXACT same arrow, cut LONGER than mine, and shoot at a HIGHER draw weight, and have no issues?
Yeah, yeah. Sorry I missed your call. Anyways, I guess my new side question would be WHY I I'm showing weak spine with this setup, and Rob wasn't with his 28.5" of the same spine and higher poundage? Rob, you did mention you shot them through hoyts and bowtechs. How long ago was it? Any chance those bows would have been considered a medium cam, and not a hard cam like the 101st? That's the only explanation I can come up with. Anyone with AA or OT2 here? I may have to check over on HNI :d
GMMAT has some good points. Does a bareshaft hit the same as your fletched arrow? Bareshafting will give you a real good indication of your tune and dynamic spine pretty quickly.
Matt I don't think you have a spine issue. However I would like to know what type of fletching you are using. Little 2" fletching is good for speed but not for stablizing broadheads. If you are using these small fletching that could be your problem. This would be especially true if you are trying to shoot a fixed blade braodhead. Try either moving to mechanicals or a larger fletching (I shoot feathers because they only weigh 8 gr for all 3 4" feathers whereas vanes weigh about 20gr per 3. This also gives you a little more FOC and feathers are proven to fly better that vanes, it's just mother natures plan!).
BH's hitting to the left of your FPs is an indication of a weak spine reaction with left hand bows (just the opposite for RH shooters). I setup centershot using walkback tuning, I didn't bareshaft tune, but I may do that next, but at the time, I didn't have a fletching jig, and I bought the arrows pre-built, so I didn't want to remove the fletch on perfectly good arrows. FPs were flying great, no tailing even out to 50 yds. So, August rolls around, and I throw my 100gr Slick Tricks on, and at 20yds, I'm hitting a hair left of my FPs. So, I move the rest...and crap. Literally as I'm writing this, I may have realized what I'm doing wrong. If you are showing a weak spine shooting RH, your BHs impact to the RIGHT of your FPs. You are then to move your rest AWAY from the riser. If adjustments are opposite for LH, I would still move the rest out away from the riser, or would I move it toward the riser? Essentially according the RH guide, you are chasing the FPs by moving the rest away from the riser, so shooting LH, and hitting left, you would still chase the FPs, and move the rest outward, right? Ben, centershot was set with a walkback tune.
