poor grouping at 90m

[cava75]

My groups are quite good at 30, 50 and 70m (at this distance I've got an average of 57 on 6 arrows) while at 90m my arrows are way too large.

My setup is:
Protec XT2000 with spirals 60# at 28.5" DL.
Cartel Triple 300, 27,7" from end of shaft to nock groove, 120grns points, hunter nocks and FFP187 (right offset, about 3

[Sandy Hancock]

*This is not an advertisement*
Have you tried Jim Park's Accurate Sights software? It may give you a head up as to where the problem is. At least it should be able to quantify how much your groups should spread at 90m.
Come to think of it, Trevor and Marianne's TargetPlot may help too.
I own neither, and have no interest in either company.

[The One]

Those arrows are heavyish, so I would expect your 90m sight mark to be quite low. Remember that at 90m, your bow angle will be different, and changes in your anchor position may be spreading the group a bit. Sometimes it can be a psychological thing too. Practice frequently at 90m, and it may help.

[New Tricks]

Peep alignment can go out the window at 90 as you anchor changes. Concentrate on centreing the scope properly.

[arngeir]

i whould have tried to go down to a 100 grain point
gives more stable arrow speed all the distanse.

[The One]

i whould have tried to go down to a 100 grain point
gives more stable arrow speed all the distanse.

I thought that heavier arrows lost their arrow speed slower than light arrows due to inertia

[Milkovitsch]

Ciao Cava,

I had exactly the same problem. I have few suggestions;

1. Have you been shooting your arrows for a long time? They will wear from being shot into stramit, and you will be surprised just how much they might vary from one to the other. Any difference is exagerated at 90m.

2. The arrows are too heavy or too slow. I would put lighter points.

3. Check the tuning. Are the arrows leaving nice and straight, are you getting reasonably good paper holes? I would have expected this to not matter by 90m, but experience tells me otherwise.

Buona fortuna :D

[arngeir]

yes thats right but thay axlereate slower to so you dont get hihg enogh speed in the begining.
and a ligter arrow will stiffen up the arrow.


you can easly se this if you meashure the distanse beetween you sight marks, i would suppose there ar bigger distanse betwen 70-90 than between 50-70

[dbjac]

yes thats right but thay axlereate slower to so you dont get hihg enogh speed in the begining.
and a ligter arrow will stiffen up the arrow.


you can easly se this if you meashure the distanse beetween you sight marks, i would suppose there ar bigger distanse betwen 70-90 than between 50-70

are you drunk? or do you normally type like ninevalleys? :wink: :lol:

[cava75]

Thank you all!

I've tried arrows with spin wing, the smaller ones and got slight better groups.
But I don't really think it's a matter of fletching itself.
I gain at least 7 grains and so a sliiiight increase in speed, while the arrow should be a little weaker.
I will give 110 and 100 grains points a try, but a stiffer shaft...

regarding the wear, I've shot them almost only in foam targets, for all training sessions and in tough targets only in shoots, so I don't think this is the issue, but eventually I'll try to shoot all them through the paper to see if there is any difference.

[The One]

yes thats right but thay axlereate slower to so you dont get hihg enogh speed in the begining.
and a ligter arrow will stiffen up the arrow.


you can easly se this if you meashure the distanse beetween you sight marks, i would suppose there ar bigger distanse betwen 70-90 than between 50-70

Having poor grouping at 90m is often attributed to excessive drag. Making the arrows lighter will only increase the magnitude of this problem.

[dbjac]

but getting rid of that 3 degree offset should help a lot.

[Marcus]

I used an almost identical setup to you on the weekend. 27.5" Triple 300's with 120 grain points and Hunter nocks. However I used 1.5" X-Vanes with no offset. They grouped very very well at 90m. Only put one out of the gold in the 2 practise ends.
I would suggest trying a smaller vane before trying a lighter point.
Also make sure your weight matching is good, around 0.5grains, and also make sure your cam timing is spot on with the spirals. Even half a twist out will cause random high shots.

[apexrob]

I'd hate to state the truth here...If you want to score better at 90m..Live, Breath and **** it . Hell, my arrows where doing backflips at 90, still went in the gold , shootin 330 ends. I beleive once you can shoot 320+ then start worrying about the smaller variables that only really get you a few points. The rest is skill chumps.

[Marcus]

Yeah I agree, 90m is a practise thing, must be done alot. The stuff you get away with at shoter range becomes 6's and 7's at 90m.

[BrokenArr0w]

Yeah I agree, 90m is a practise thing, must be done alot. The stuff you get away with at shoter range becomes 6's and 7's at 90m.

yeah.. 6 and 7's :( with recurve its worst!

[dbjac]

actually, i didnt shoot a single 6 on the weekend. I think there were a few 7's though... :cry:

[cava75]

I'd hate to state the truth here...If you want to score better at 90m..Live, Breath and sh*t it . Hell, my arrows where doing backflips at 90, still went in the gold , shootin 330 ends. I beleive once you can shoot 320+ then start worrying about the smaller variables that only really get you a few points. The rest is skill chumps.

I totally agree with you, but i scored 316 at 90m last sunday (and it was not properly a good day...), not so far from 320 and with two 6!
The point is that I really think that with my current form I can do better!

I know that a little lack in form makes a big difference in impact at such distances, but now I don't completely trust my equipment, and this is bad!

Marcus,
spin wings were fletched with 0 offset... so I will try smaller vanes with less offset, something near 0,5