H80Hunter

I shoot a Bear TRX as listed in sig, it is set at 65-66 pounds of draw weight. I shoot a 29" Draw with a string loop and kisser button on the string.

This year I am looking to get some new arrows and will probably either get Gold Tip XT Hunters 5575 (~8.2 gpi) or some CX 300's (8 gpi). With the Whisker Biscuit rest set back behind the grip a little, I imagine I could go to like a 28.5" arrow or so. What kind of finished weight am I looking at with a 28.5" arrow with 3 vanes and a 100 grain tip? Also, what kind of speeds would you guess I could get out of my bow? Im not a speed freak, and obviously I know I dont shoot a bowtech/mathews, but I imagine it is capable of some decent speed. IBO is 305, AMO/ATA is 234.

This is long enough, but lastly, its strictly a hunting bow, so I dont want to go extremely light, but something that will give method trajectory out to like 30-35 yards. The bow is plenty quiet, but I feel like I have some more speed I can get out of it without sacraficing too much in other areas.

zak123

What kind of vanes do you shoot? I have heard a formula that you can use to roughly check your speed. It is not 100% accurate, but it is pretty close.

First you have to find out your total arrow weight.
Subtract the total arrow weight from the IBO arow weight (350 grains).
Subtract 10 fps per inch of draw length under IBO standards (30" )
Subtract weight from IBO standards which I believe is about 2 fps per pound. IBO weight standard is 70 lbs.
Subtract string loop speed ( I was told that was 4 fps).
Subtract peep site speed ( I was told that was also 4 fps).
Subtract silencer weight (1 fps up to 15 fps).

I will try to add this up and find your speed. If I remember this correctly I may be between 10 fps. I know this is not close, but it will give you an idea.

newman1

I come up with 384 grains

zak123

Good guess newman1. I got between 377.7 grains and 387.7 grains depending on which vanes you use.

I calculated your speed to be about 262 fps with either arrow. The Whisker Buiscut rest takes off a few fps. I remember reading that it takes about 7 fps with a hard helical and 4" vanes. I may be way off, but I have found this method to be +-10 fps.

H80Hunter

Im not sure what vanes I will get. I am thinking of going with a 3" helical, or a 4" either offset of helical. If I shoot a small mechanical like a steelhead 100, would the 3" helical be adequate? Or should I get the 4 inch?

zak123

I have heard of people using straight vanes to control mechanicals. I have also heard that the harder the helical the more control you get. I am not sure which would be better for you as I only shoot fixed. Feel free to correct me if I'm wrong.

newman1

Yeah i knew i would be close.I just chose the 4 inch duravanes

zak123

4" Duravanes weight 8 grains right? I used the "4 Duravanes and 4" Bohning vanes, which weight 12.5 grains.

newman1

Go with the 4 inchers,or maybe better yet the 2.5" quickspins.Someone said they are bad a$$ with mechanicals.

newman1

There is no way Bohnings weigh that much,Quickspins are supposed to weigh 12.5 each