An offer to help

[Hillbilly270]

thanks for the help todd.  I am new to bowhunting so what is FOC?

I have a 07 Ross Cardiac and i believe its 33" cam to cam
29" DL @ 70#
340 Easton ST Axis  @ 29" long with three blazer vanes
3 blade 100gr broadhead

thanks again.

[bonkellekter]

thanks for the help todd.  I am new to bowhunting so what is FOC?

Percent Front Of Center represents the percentage of forward weight on your arrow. For indoor match shooting, the ideal %FOC is between 7% and 9%. For hunting situations using broadheads, the ideal %FOC is between 9% and 15%.

[Galpster]

I have a Remington 30.06 shooting 150 grain Remington Corelokt. Oooh this is bow. Never mind. I know the ballistics when I throw a stick thru the air.

I started one in the guns section. I hope someone is as nice as you are. Great job sir. Very cool!!

[bonkellekter]

I appreciate the offer - How much and where did you get the software?

2007 Browning Illusion 64/65# Gold Tip 7595 (8.9 grains/in.), 28.5" draw length, 28.5" arrow cut length, muzzy 100gr 3-blade, 4" straight fletch, standard gold tip inserts & nocks

http://www.pinwheelsoftware.com/ and $27.95.  The free trial version doesn't have many selections but does have all the functions active, then you download the upgrade once you buy it.

Here's what I found for you:
The recommended spine with your setup is .401, which is exactly the spine of the 5575's.  Maybe stepping up to 125 grains is feasible?  Your setup shows: 275 fps, 9.76% FOC, 69.8 ft-lbs KE and 415 grain arrow.  Go to 7595's with 125 grains is: 270 fps, 12.7%, 71.3 ft-lbs, and 440 gr.  Probably fly better and hit harder, but if the way you have it now works, then stick with it, for sure.  5577 and 100 gr is: 276 fps, 8.5%, 69.3 ft-lbs, 407 gr (not enough FOC for Muzzy, in my opinion).   Go with 5575 and 125 gr, then: 271fps, 10.9%, 70.9 ft-lbs, 432 gr.  The last is the best choice if you didn't already own the stuff, but if you're having tuning/grouping problems, then the spine and FOC issues are possibly why.

Arrow drop 20-50, KE @ 50 yds
7595 and 100 gr: 32.2" 55.2
7595 and 125 gr: 33.6", 56.3
5575 and 100 gr: 31.7", 54.9
5575 and 125 gr: 33.1", 56.1

Todd - I have also been wanting to turn my bow back up to 70#, what would the numbers look like using  7595 & 125's @ 70#

Thanks

[Todd_ID]

I appreciate the offer - How much and where did you get the software?

2007 Browning Illusion 64/65# Gold Tip 7595 (8.9 grains/in.), 28.5" draw length, 28.5" arrow cut length, muzzy 100gr 3-blade, 4" straight fletch, standard gold tip inserts & nocks

http://www.pinwheelsoftware.com/ and $27.95.  The free trial version doesn't have many selections but does have all the functions active, then you download the upgrade once you buy it.

Here's what I found for you:
The recommended spine with your setup is .401, which is exactly the spine of the 5575's.  Maybe stepping up to 125 grains is feasible?  Your setup shows: 275 fps, 9.76% FOC, 69.8 ft-lbs KE and 415 grain arrow.  Go to 7595's with 125 grains is: 270 fps, 12.7%, 71.3 ft-lbs, and 440 gr.  Probably fly better and hit harder, but if the way you have it now works, then stick with it, for sure.  5577 and 100 gr is: 276 fps, 8.5%, 69.3 ft-lbs, 407 gr (not enough FOC for Muzzy, in my opinion).   Go with 5575 and 125 gr, then: 271fps, 10.9%, 70.9 ft-lbs, 432 gr.  The last is the best choice if you didn't already own the stuff, but if you're having tuning/grouping problems, then the spine and FOC issues are possibly why.

Arrow drop 20-50, KE @ 50 yds
7595 and 100 gr: 32.2" 55.2
7595 and 125 gr: 33.6", 56.3
5575 and 100 gr: 31.7", 54.9
5575 and 125 gr: 33.1", 56.1

Todd - I have also been wanting to turn my bow back up to 70#, what would the numbers look like using  7595 & 125's @ 70#

Thanks

7585 with 125 grains and 70# draw weight want .373 spine, so it looks fine with the 7595's having a .340 spine.  The numbers: 276 fps, 10.47% FOC, 76.8 KE, 452 grains.
All that looks good!

Arrow drop 20-50, KE at 50
31.8", 60.7 ft-lbs

[Todd_ID]

thanks for the help todd.  I am new to bowhunting so what is FOC?

I have a 07 Ross Cardiac and i believe its 33" cam to cam
29" DL @ 70#
340 Easton ST Axis  @ 29" long with three blazer vanes
3 blade 100gr broadhead

thanks again.

Bone had FOC correct: it's the percentage forward of the measured center of the arrow to where it balances versus its overall length.

You setup numbers:
The software says you need a .333 spine, so the .340 spine is perfect.  The spine is nothing more than a measurement in inches: suspend the arrow at 28" centers and put a 2# weight in the middle: yours would bend .340", hence the 340 designation.  It shows 285 fps, 11.46% FOC, 79.4 ft-lbs KE, and 438 gr arrow weight.  Nothing wrong with that, especially for anything on this continent.

Arrow Drop 20-50, KE at 50
28.25", 67.7 ft-lbs

[bonkellekter]

Looks good to me too - thanks alot. I'm going to go ahead and get the software too for future setups and to help out my freinds who don't spend any time online.


(PS) - my bow shot the chrono @ 276 fps w/ my current setup. So the program is right on.

[LittleJohn]

I want to compare the Z7 to the Destroyer

I want them set at 67 lbs  29.5" draw, and shoot a GT 7595 arrow cut at 28.5" with a 120 gr tip.

do u need more info???

[Todd_ID]

I want to compare the Z7 to the Destroyer

I want them set at 67 lbs  29.5" draw, and shoot a GT 7595 arrow cut at 28.5" with a 120 gr tip.

do u need more info???

Got the PM on the clarifications.
What I found:
Z7: 302 fps, 13.6% FOC, 84.4 ft-lbs KE, 417 gr arrow (didn't even have to adjust to meet your PM weight).  It shows the spine should be .323, so the .340 would be fine with good form on each shot.

Deystroyer 350: 312 fos, 13.6%, 90.1 ft-lbs, 417 gr.  The spine should be .295, so you need to go to a .300 spine arrow to get decent flight.  I put in a ST Axis 300 to see how it would change: 296 fps, 12.34%, 96.4 ft-lbs, 495 grains using a 125 gr head w/o your weighted inserts.  This arrow was perfect spine for your setup.

Arrow Drops 20-50, KE at 50
Destroyer, Axis, 125 gr: 25.9", 82 ft-lbs
Z7, your arrow and head: 24.7", 71.4 ft-lbs.

Hope this helps in the decision.  Just remember to shoot them both.  A fast miss is still a miss if you don't like either one.

[LittleJohn]

THANKS ALLOT !!!!! I apreciate your time

[lokidog]

Golden Eagle Splitfire I  early 90's? can't remember when I got it, bow is set at 29" draw 75% let off.

31" Cabelas carbon hunter 65/80, 4" vanes. Muzzy MX3, 100gr

Try with the bow at 60 and 70# please.  I don't know the current draw weight but want to get back to 70.  Thanks.

[Todd_ID]

Golden Eagle Splitfire I  early 90's? can't remember when I got it, bow is set at 29" draw 75% let off.

31" Cabelas carbon hunter 65/80, 4" vanes. Muzzy MX3, 100gr

Try with the bow at 60 and 70# please.  I don't know the current draw weight but want to get back to 70.  Thanks.

I guess the program doesn't have anything before 2002 for some reason.....didn't notice that before.  Sorry!  Also, 90's was pretty much pre-internet information storage by-and-large, so I dind't find any information on it from back then either.  Did find that Golden Eagle was bought out by Bear Archery in the early 2000's.

[lokidog]

Figures.....

You could try my wife's for me.

Martin Cheetah 55-70, 2009, 25" draw length set at 45lbs shooting 100gr Muzzy MX3 and 25" Cabelas Stalker Extreme 55/70 with blazer fletches.

Thanks again.

[Todd_ID]

Figures.....

You could try my wife's for me.

Martin Cheetah 55-70, 2009, 25" draw length set at 45lbs shooting 100gr Muzzy MX3 and 25" Cabelas Stalker Extreme 55/70 with blazer fletches.

Thanks again.

Ok, that one I can do.  Been a busy day at work, so it took me a while.  It says she needs a .728 spine and the ones she has are .390, so it's way too stiff... If it's flying well enough, then leave it alone, but if you've got problems with flight, then it's probably the stiff spine.  The numbers: 214 fps, 14.5% FOC, 35.3 ft-lbs, 346 gr arrow weight.  If you decide to by new arrows for her sometime in the future, then PM me, and I can run the numbers again and the software has a bunch of recommended arrows in the correct spine range that I can give you to research.

Arrow Drop 20-50, KE @ 50
54.8", 30.2 ft-lbs

[lokidog]

Todd, thanks.  Could you run this with her bow at 55 pounds?  We figured they might be a bit stiff at 45 pounds.  She is working on increasing it as she can.