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Discussion Starter #1
Does this sound right:

28"/70 lbs
Shooting a Beman ICS Hunter 300 w/125 grain tip total weight = 448 grains

Bow shooting about 270-272 fps.

Seems maybe a tad slow to me, but does this sound right?
 

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Sounds right to me

Sounds about right to me. That is a extremely heavy arrow.

IBO is from a 5gr per pound arrow and they still won't quite reach the 332 IBO. It isn't far off but the heavier the arrow the slower the bow is and the more kinetic energy for hunting purposes.

If you want to shoot your bow fast, I am assuming your bow is 60lb when I say this, then shoot a 300gr arrow and see how fast it is at 60lbs. At a 28" DL you should be close to 305 fps depending on which arrow diameter you are shooting.

Hope that makes sense.
 

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You're dropping 2" off IBO set up, plus 100 grains heavier on the arrow. Your speed sounds about right. The only way to up your speed is to change to lighter arrows.

I get 308 out of mine ste at 29", 70 lbs, 376 grain arrows.
 

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bubbaraszt
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arrow speed

I shoot a mathews switchback xt 28" and 70lb ibo is 315
shooting a 385 grain arrow im getting 285, you should be low 300's
 

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Ran that setup through ontarget and came up with about 285 fps, so I'd say you are running about 10 fps slow give or take a few fps. How are your axle to axle and brace height measurements relative to factory specs? Might want to check tiller as well. Also if you have the monkey tails on the strings and cables that could be accounting for some of the speed loss.
 

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Discussion Starter #6
A2A and BH are right on the money.

No monkey tails on the string.

I kind of figured I should be 10fps as well.
 

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The 28/70 Z7 I had shot 302 with a 367 grain arrow and loaded up string (d-loop and peep). Those speeds seem good to me considering your shooting an arrow that weighs 81 grains more. You're gonna lose another 30 fps with that heavy arrow over me.
 

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I shoot a mathews switchback xt 28" and 70lb ibo is 315
shooting a 385 grain arrow im getting 285, you should be low 300's
No way any Z7 is going to throw a 448gr. arrow @ 300fps with 28"/70 specs. Just won't happen, those are strong "speedbow" numbers.

You should be somewhere between 277-282fps.

The XT above is about right but in all reality probably closer to a true 28.5" draw.
 

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Sultan of Smack
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I've got a 28" Z7 @ 68lbs. Shooting a 445gr. CE Edge at 276fps. Only thing on the string is a D-loop.

SCFox
 

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I AGREE.
No way any Z7 is going to throw a 448gr. arrow @ 300fps with 28"/70 specs. Just won't happen, those are strong "speedbow" numbers.

You should be somewhere between 277-282fps.

The XT above is about right but in all reality probably closer to a true 28.5" draw.
Sounds like your bow is right on with the numbers. should be around 280 fps. i wish my maxxis could shoot a arrow that heavy at 300fps. But its never gonna happen:D
 

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A2A and BH are right on the money.

No monkey tails on the string.

I kind of figured I should be 10fps as well.
I did some research and found one guy who stated that after he removed the monkey tails he actually lost about 5 to 8 fps, so he put them back on and sure enough gained the lost fps back. Not saying that is the problem but if you still have them might be worth a shot, also you might be able to play around with the string grub positioning and see if that helps anything. Don't know that any of this will but shouldn't hurt to try.
 

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Does this sound right:

28"/70 lbs
Shooting a Beman ICS Hunter 300 w/125 grain tip total weight = 448 grains

Bow shooting about 270-272 fps.

Seems maybe a tad slow to me, but does this sound right?
WOW... what in the world were you expecting ?!? That is a very impressive speed for a very heavy arrow!

I'm shooting a 28"/63# Z7 with a 330 gr and "only" getting 302 fps.
 

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At 30 inch draw and 66# my Z7 is flinging my 448 grain Easton's nfused at 278 fps. I took the monkey tails off though.

My Software for Archers Ontarget2 says my FOC is at 10.36%, Grs/LB 6.788 and KE at 76.80. It also says my arrows should be flinging at 275.49.
 

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I don't know why everyone thinks 448 grains is such a heavy arrow. That would be the minimum I would hunt with.
 
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