20 vs 40

[gundog]

If you set a cross hair up to zero at thirty will it still work at 20 and 40 with a 175 pound bow. Trying to get something that will work with the old eyeballs. Or is the drop to much. I think I will play around with this. Anyone have any experience with this?

[steve rodo]

20 Yards = 8.70 Inch Arrow Drop.
25 Yards = 16.30 Inch Arrow Drop.
30 Yards = 26.10 Inch Arrow Drop.
35 Yards = 38.10 Inch Arrow Drop.
40 Yards = 52.20 Inch Arrow Drop.

[Bobby B]

20 Yards = 8.70 Inch Arrow Drop.
25 Yards = 16.30 Inch Arrow Drop.
30 Yards = 26.10 Inch Arrow Drop.
35 Yards = 38.10 Inch Arrow Drop.
40 Yards = 52.20 Inch Arrow Drop.

Sorry but this has me baffled.

The OP was "zeroed at 30 yards" question. I'm new but I've been hunting since I was 6 years old and have a ton of experience with verticle bow and rifle hunting, but didn't understand your response.

Thanks

[Boo]

20 Yards = 8.70 Inch Arrow Drop.
25 Yards = 16.30 Inch Arrow Drop.
30 Yards = 26.10 Inch Arrow Drop.
35 Yards = 38.10 Inch Arrow Drop.
40 Yards = 52.20 Inch Arrow Drop.

Sorry but this has me baffled.

The OP was "zeroed at 30 yards" question. I'm new but I've been hunting since I was 6 years old and have a ton of experience with verticle bow and rifle hunting, but didn't understand your response.

Thanks

I believe Steve is illustrating the variable drop of an arrow per 5 yard increments. Even at that, add brace height, total arrow weight, string type and various fletchings and you have more differences in trajectory.
Rick you'll have to be more specific. If you mean can you use center crosshairs only to hit a deer at 20 and 40 if zeroed in at 30 then the answer is yes if you use some Kentucky windage.

[Bobby B]

Thanks Boo as I was truly confused for a moment. Not enough coffee LoL

[Boo]

Thanks Boo as I was truly confused for a moment. Not enough coffee LoL

Bobby, I might be confused as well! So goes the last half of my life!

[nchunterkw]

Arrows and any projectile, travel in a parabolic shape (arc) due to the effects of gravity, wind resistance etc. Steve's reply showed the arrow drop with a "0yd 0", meaning you are shooting the bow with the arrow starting out parallel to the ground. When you zero at any distance greater than 0, the arrow starts out going upwards, reaches the highest point of it's arc then starts dropping from there. Therefore and arrow shot from a bow with a 30yd zero will launch with a higher upward angle than when launched from a 20yd zero bow. My guess is if you zero at 30 you will be a little high at 20 and low at 40. My experience tells me you will not be able to zero at 30 and use the same crosshair at 20 and 40 and stay within the kill zone on a whitetail. As Boo said, you will need to use Kentucky Windage (I wasn't aware that worked in Canada though ) The arrow slows much more from 30 to 40 than it does from 20 to 30. I used to zero at 25 and be about 0.5" high at 20 and 1.5" low at 30 with my old Horton Legend crossbows, but even then 35yds was too much to use the same reticle. Let me plot some data from the Excal site and I can give you a pretty good guestimate. Wait one.

[nchunterkw]

Based on the data from the Excal website - A 175lb bow should be shooting a 400gr arrow about 295fps with a FFF string. So I used the trajectory data they provide for 300fps. Using that curve and adjusting it for a 30yd zero (I know it's not exact, but should be close) my guess is with a 30yd zero you will be about 4" high at 20 and about 7" low at 40. Let me know what you find in the real world if you try it out.

[Hooks1]

I have the Hawke BRC and assuming 290 fps with the scope height at 2 inches this is what it gave me.

5 yds - + 1.1
10 yds - + 3.14
15 yds - + 4.08
20 yds - + 3.89
25 yds - + 2.55
30 yds - 0.0
35 yds (- 3.77)
40 yds (- 8.84)

Hope this helps you out. You really need to shoot your broad heads to see what you actually get.

[hummer]

Does anybody know of an "arrow ballistics" program/formula where you can put in various arrow weights/speeds & zero distances and calculate drop at various distances?

[Hooks1]

Does anybody know of an "arrow ballistics" program/formula where you can put in various arrow weights/speeds & zero distances and calculate drop at various distances?

Go to the Hawke Optics website and download the BRC program, it's free.

[gundog]

The winds are gail force today so perhaps tonight. It does appear to be a lot of drop at the forty mark. I found a scope today with a reticule that would burn a hole in the target when turned on. This might help me as their is a cross hair setting that might help the Kentucky guessing. A cross hair with two horizontal lines would be great. But they would have to light up. The big ole lighted lines that most people would not like is what would work best for me. Thanks for the input gentlemen.

[Limbs and Sticks]

Sorry guys, 0 to forty single xhair in kill zone pencil-tucky windage after 40, you have a happy medium with every bow,i figured this out 40yrs ago, same as using one pin on my old compounds, on a full grown deer you have a 14'' circle kill zone, any place in it dead deer, this is what works for me, a little note my 350gr sticks are still moving on at 40yds.

Wes

[Boo]

You could also use the bottom of the top reticle for 20, the crosshairs for 30 and the top of the bottom reticle for 40

[hummer]

Go to the Hawke Optics website and download the BRC program, it's free.[/quote]

Great - thanks Hooks.