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Post by antiwheeze on Sept 18, 2007 15:36:31 GMT -5
Just curious if this happens to anyone else of if anyone has an explanation. My 100 grain 3 blade Muzzy broadheads group 3 inches lower than my 125 gr field points at 20 yds and about 6 in lower at 30yds. Both heads fly and group equally well and impact the same left and right. Why would lighter arrows impact lower?
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Post by hoosieroutdoorsman on Sept 18, 2007 16:01:08 GMT -5
I think the big difference is the 3 blade head compared to the totally round field tip,,the blades may be catching more wind and forcing the head down,,some broadheads will make arrows do different things,, I would try a different broad head if you have a friend with something you could borrow and see if the same results happen.
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Post by davepowers on Sept 18, 2007 16:08:24 GMT -5
At 20 yards I can not see a difference but longer shoots I can. It really depends on bow weight, arrow length, and draw length. One reason could be the extra weight allows more energy transfered from the string to the arrow this helps carry the arrow further before dropping off. That is why some shoot heavy arrows and will not shoot carbons or they use weight tubes. There is a lot of good reading out there on this just do a search or go to archery talk and search and you will get more information than you want.
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Post by indianagooseman on Sept 18, 2007 20:09:48 GMT -5
It's wind planing down because your arrow is leaving your rest at a slightly downward angle, you don't notice it with your field points because they don't plane. Bump your rest up a 1/16" at a time and they will come together.
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Post by huxbux on Sept 18, 2007 20:26:24 GMT -5
It's wind planing down because your arrow is leaving your rest at a slightly downward angle, you don't notice it with your field points because they don't plane. Bump your rest up a 1/16" at a time and they will come together. This would have been my guess. Sounds like your bow is slightly out of tune. |
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Post by hoosieroutdoorsman on Sept 19, 2007 18:50:00 GMT -5
btreviews.proboards57.com/index.cgiCheck out this site,, Bowtech the guy that owns and runs it does mega field testing for broadhead companies. The guy is very very thorough and has alot interesting info.
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Post by bowpro1 on Sept 20, 2007 6:00:14 GMT -5
It also changes the spine of the arrow.
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Post by Russ Koon on Sept 25, 2007 10:45:40 GMT -5
I agree with Indianagooseman's advice above. Either raise the rest slightly or lower the nock point slightly.
To be even more accurate with tuning, you probably should get some 100 grain field points and tune for same point of impact with them and the Muzzys. You should find a very slight difference in right and left impact with the same weight heads, since they are now hitting the same right and left with different weights. The change required to get things perfect will be very small, but is worth doing to have the confidence that you should have in your gear being exactly right.
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Post by Sasquatch on Sept 25, 2007 13:47:24 GMT -5
Broadheads will almost never strike the exact same place as field points, even from perfectly tuned bows. The aerodynamics are completely different. This difference in point of impact can be up or down or left or right, usually left and right. In 15 years of doing it, I got my broadheads to hit exactly the same place as field points once. Sure, most of the time they were very, very close, but close is not the same.
In your case, they appear to be hitting quite a bit lower, so there is probably some tuning issues. Try the tweaks mentioned above and see if the difference gets smaller. Of course, there will always be some difference with with a 25 grain weight difference, but I'm sure you know that. I highly recommend getting some matching field points.
Once tuning is eliminated as a cause and the broadheads are hitting the same place every time then it's not an arrow flight issue. By far the most realistic approach is to verify that you are getting good flight with broadheads, then if they are hitting slightly off from where the field points hit, adjust your sights to compensate. Forget about the field points and go shoot us a monster. We want pics!
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