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View Full Version : What's your FOC %?



elk*hunter
01-30-2012, 03:28 PM
Arrow forward of center percent. What you guys got? I am 8.5% and I get good broadhead arrow flight they actually matches my field points. 350 total grains on my arrow, 298FPS. I have scene 7-10% is the range you want to be in from the "industry?" Any other info you got on the matter would be helpful.

Here is a simple archery calculater I have been using:

www.stickemarchery.com/stickemcart/archery-calculators.aspx

Jon Boy
01-30-2012, 06:41 PM
Just used that calculator and came up with 8.9 %

ontarget7
01-30-2012, 07:04 PM
I seem to always stick with around 12% it gives me the best overall performance for my set ups.
Especially the longer yardages. When I am below 10% I feel my groups aren't as tight down range 60 and beyond.

Maxhunter
01-30-2012, 07:19 PM
I seem to always stick with around 12% it gives me the best overall performance for my set ups.
Especially the longer yardages. When I am below 10% I feel my groups aren't as tight down range 60 and beyond.

Mines always 11-12% also for best overall performance.

packer58
01-30-2012, 07:56 PM
11-12% FOC / 390 grain arrow, I also feel it helps maintain tighter groups at longer ranges.

elk*hunter
01-30-2012, 08:03 PM
I was toying around with throwing 125gr broadheads on and that would get me in the 12% range if the spine on my arrow can handle it. Will loss FPS but it might equal tighter groups and more forgiving down range. Never been above 10% so good to see others having success above that.

ontarget7
01-30-2012, 09:01 PM
I was toying around with throwing 125gr broadheads on and that would get me in the 12% range if the spine on my arrow can handle it. Will loss FPS but it might equal tighter groups and more forgiving down range. Never been above 10% so good to see others having success above that.

What is your bow specs and arrow specs ? I will check the spine out for you and run some numbers

elk*hunter
01-30-2012, 10:07 PM
Bow is 28" draw, 70#. Arrow 29" 8.4gpi, 3 blazer vanes, easton insert and nock.

ontarget7
01-31-2012, 06:08 AM
Bow is 28" draw, 70#. Arrow 29" 8.4gpi, 3 blazer vanes, easton insert and nock.

What bow? As well as what spine arrow ?

elk*hunter
01-31-2012, 06:47 AM
Hoyt Turbohawk and 55/70 Cabelas Carbon Stalker Extreme(Beamen nock off).

ontarget7
01-31-2012, 07:08 AM
Hoyt Turbohawk and 55/70 Cabelas Carbon Stalker Extreme(Beamen nock off).

I believe those are a 400 spine and with your specs I definitely would not go any heavier on your tip weight.

However something doesn't jive with your total weight you mentioned in your original post 350 gr. At 8.4 grains per inch that puts you at 243.6 just raw shaft. So if you have a 100 gr. tip blazers, inserts and nock that would put you well over 350gr. Even at a 85 grain tip would be still over the 350gr. Just bringing this up because your FOC just might be more than you think. Maybe you had a number off on your calculations.

elk*hunter
01-31-2012, 07:16 AM
Yea man my calculations were way off. 393 grains total...that changes things. What do you think now ontarget?

elk*hunter
01-31-2012, 07:22 AM
That gives me 10.3% FOC.

ontarget7
01-31-2012, 07:51 AM
That gives me 10.3% FOC.

If those are grouping well broadheads and field points I wouldn't change a thing. When I shot A/C/C's my FOC was right where you are at and they flew great. When you need arrows in the future I would look at going to a 340 spine to see if you can shrink those long range groups. With that you will need to retune for the spine because your centershot will slightly change with a new spine.

I wouldn't go to a 125 grain head with your current set up it would weaken your spine even more. I would leave it alone

elk*hunter
01-31-2012, 09:31 AM
Sounds good, thanks for the insight.

ontarget7
02-04-2012, 06:34 AM
Sounds good, thanks for the insight.

Not a problem, anytime.

Shane

gary5465
02-04-2012, 08:58 AM
Mine is 11%

purebowhunting
02-09-2012, 05:13 PM
Ontarget, what program do you use if you dont mind me asking?

EDIT: The program you use to determine correct spine of specific brand arrows.

packer58
02-09-2012, 09:45 PM
Not trying to step on any toes here but if your wanting to calculate the FOC (front of center ballance) of your arrow setup, Google "arrow FOC". There will be many sites that will tell you how to do the calculations along with recomended FOC for field tips and broadheads. Hope this helps...........

ontarget7
02-13-2012, 03:31 PM
Ontarget, what program do you use if you dont mind me asking?

EDIT: The program you use to determine correct spine of specific brand arrows.

Sorry I didn't get back with you sooner but was in Vegas in the 3 day archery shoot this last weekend.

I use the TAP Program. There spine selection has been very accurate for me and they are extremely user friendly