Dynamic spine and lead weights

[jackdaw]

For the indoor season I would like to use 2315 XX75s, however the spine is far too stiff for my setup (I should be using 1916). I understand that using longer arrows with lead in the piles can reduce the dynamic spine. Has any one any experience of this? If so how much extra length? how much lead?

[Shirt]

You can usually make a bit of a stiff arrow weak enough to tune well like that... what you're thinking of is massively too stiff, I doubt it would work with conventional tuning.

[greydog]

The most a 2315 100grain bullet point seems to take is another 100grains of solder, giving a 200grain point which seems to do the job (depending on your bow, draw length and poundage) if you need to go higher than that, you'll probably need to buy Pro Points www.competitionarcheryproducts.com
Simon Terry was shooting fat aluminiums at Accrington and seemed to do ok ( 584 fita 18), not sure how much he increases the point weight by to get them to spine though.

[Mick]

I shoot 2314 X7s @ 291/2"
Around 41lb on my fingers.
I got the arrows to spine by melting solder in the nib points the weight of the points with the solder added is 200.6 grains. Do it with care, too much heat and the alloy on the points will melt. I filled the points to the brim and when cool adjusted the weight by carefully hand drilling into the solder until I got them all to within 1/10 of a grain. Took patience and the best part of a Saturday morning in the workshop. Was it worth it? Dunno, indoor scores have been a little more consistant this season without showing any significant increase.

[Dave Draper]

I have never tried adding 100gr to my pile weight, but I found that an increase from 70 to 100 could be tuned out using the pressure button; so it wasn't that effective. What I have discovered, though, is that an increase in arrow length has a big effect on its dynamic spine. I have found that an increase of 1 inch in length is equivalent to about one spine change in the ACC range. Although you are using alluminium arrows, it will still apply. So you should be able to judge how much extra length you need. Try buying a couple of shafts really long and cut them down quarter inch at a time until they tune in.
Regards,
Dave

[Hidden Hippo]

The main problem I foresee with using massively overspined arrows would be the fact that would would have to change the clicker in order to cover the extra length. As for going 4 spines too stiff (on the Easton charts, which some say are a little stiff anyway) I think you would be pushing the limits of tune, even with a huge point weight.

The other problem I envisage would be that you would be shooting a 500gr+ arrow coming out of a recurve at around 40# (I'm guessing a 28/29" draw length here). This would mean the arrows will be going fairly slowly to say the least and could suffer.

In all honesty, considering the fact that quite a few shoots (for recurve) are still shot on single spot faces I think you would likely be better off going for some carbons that fit nicely into the 10 ring as you will experience quite a lot of deflections if you shoot 2315s on a single spot.

[Marcus26]

Just shoot the correct spine and you will get far more points than by going to fat arrows. (recurve only)