514grn w/17% FOC or 640 w/12%

[plentycoupe]

With these two arrow setups which one would be the best to use and why? Hunting is mostly large game. Moose, elk, bear...

both GT 7595: one 514grns w/17% FOC and the other 640grn w/17% FOC. Both would be tipped with a grizzly.

Bow is 56lbs@28", ACS CX longbow.

[daveycrockett]

I'd use the one that flies best with no worries.

[jrchambers]

which one do you shoot best? im wondering how you get a 7595 tune and weigh only 514.  i had to put 400 up front to get flight out of a full length 7595 60lbs at 29.5.

[plentycoupe]

as far as tuning I went through the entire process that O.L. explained on his webpage. At first it was very irritating because I was working with 5595 and they kept showing weak spine with everything I shot throught them.

Then one day one flew way right, hit a board and broke off at 26". I cut the end clean, put 350 up front and shot it. It flew like a dart!!???

So I got a few 7595, ended up cutting em down to 28 1/4 with 100grn brass and 145 field point and at 27 yards I can group all 6 arrows together. I can watch the bareshaft fly straight and true!!
Makes no sense to me though, but it works.

I weighed the finished arrows last night, 514ish.
I want a heavier arrow so I added a nock adapter and added 50grns to the front and the back, with the thoughts that if I added the weight in both places the arrow should still fly the same, but haven't had a chance to shoot em yet.

According to everything I have read these arrows at that length should be way to stiff.

However everything else I have read says that if I tune like O.L. said to then by the end I have the best possible arrows...........

[LKH]

Jason, I think it would depend on what and where you will be hunting.  For bou, sheep, deer I would stick with the lighter arrow just for the added trajectory advantage.  

Moose I would like the heavier arrow.

[Rob DiStefano]

absolutely the one that flies the best most consistently.  

personally, at 56# holding weight, i'd want a hunting shaft in the 550-600 grain range, and with very high foc (over 20%).  imo, the best way to do this is to use a light shaft and lotsa front end weight - don't even think about shaft spine.  for my 55# longbow, i use 500 spine carbons (quite weak spined shafts, 7.3 gpi) with 350 grains up front (insert + adapter + glue-in point: broadhead, field or judo), 4" banana 4-fletch, 585 grains total weight and 29% foc.  

these arras fly extremely well and very fast.  there is no substitute for carbon arrow experimentation and each of us are "experiments of one" when figuring out what works best for our bow(s) and us.