It really depends.
That's an open ended question.
Do you know how to calculate FOC?
How long is your arrow?
What's the GPI on your arrows?
Which fletchings are you using?
Do you have wraps on your arrows?

These are just a few of the variables.

Here's a website that tells you how to measure the arrow and it has a calculator.
http://www.alaskabowhunting.com/Webpage.aspx?WebpageId=67

 

I know how to calculate FOC.

28" arrow

All Piledriver Hunter 350 are the same GPI at 11.3

Standard Blazer vanes

No wraps

Just wanted to see if anybody else shoots piledrivers and what they have for a FOC?

 

All depends on arrow length and if you can get the spine correct to load the front. Im running almost 300 grains up front on my arrows at 21.5% FOC

 

With the heavier gpi piledrivers it will take a lot of weight to get to 19%

 

+1 if you want a higher FOC you may not want to use a heavy arrow as well. Pick a lighter GPI arrow and add the extra weight so you don't end up too heavy overall. IMO once you go over 500 grains gains FOC is dwarfed by the total arrow weight anyway so it becomes less of a factor.

 

What are your bows specs?

 

Does anybody have a concrete answer for the standard FOC % on the Carbon Express Piledriver? Would love to find out

 

There is no concrete answer.

You can go by the old rule by Easton (in my opinion needs to be updated) 10 to15%. Short arrows do better in flight at the upper end of the foc. But all arrow will benefit. Hunting long distance you want to be closer to the 15%.

If you research dr ashby and in all of his studies he shows a benefit in penetration at 19%. Lots of folks will argue this. Most argue because they are already getting a passthrough while hunting. If you are you will not see a benefit. But it’s there.

Best way to build a arrow if you are wanting foc and it dosent matter what brand. Pick a head you want. If it’s a standard 100/125 then adjust the insert weight with after market weight.(50/100gr) Build the arrow to a good average weight (500) is a good average weight. Build it with correct spine and let Foc fall where it is.

Just remember adding tip weight will cause the arrow to bend more on shot. It’s important to get the correct spine

If you want to build a specific foc then get a arrow spine program so you can play with tip weight to get what you want. Build it to around 20%. No reason to go any higher. Will it hurt no. But once you start getting above 20% arrow weight may get above what you are comfortable with.

 

I had them 2 years ago. 7%foc. Standard inserts and 100 grain broadheads. They flew like freaking darts and hit hard. Don't get wrapped up in the foc crap

 

Why do you feel its crap. You at 7% are below what the great easton recommends.

Will it work, of course it will. You are an example that it does. Does that mean it’s crap. Haha well again you are below recommendation.

 

You cant just add a ton of weight up front and be good to go. You have to factor in spine, the more weight you add to the front, the more it weakens the spine. You would have to add a LOT of weight to get the Piledriver to 19%. I don't think you will get there with these arrows without being way underspined.

 

If the arrow is stiff enough to handle it you will need around 225-250 grains combined up front give or take depending on exact length and what's on the nock end to hit 19%

 

With the heavier gpi piledrivers it will take a lot of weight to get to 19%

This is true. For reference, in the past I have used these through a 70# singlecam @27.5" DL, shafts cut to 29" with 125gr. points OAW ~500gr FOC 10.6%.

The arrows flew like darts, hit like a brick, and were tough as nails. Bow was quiet as a mouse. I've played around with arrow setups from 10.6% up to 16% or so, and I will say in my experience pushing the envelope with EFOC can overcomplicate things. I repeat in my experience, for me. I have 0% bad things to say about a 500gr arrow around 11% easy to configure, parts readily available, less tinkering, great performance out of a well tuned bow, with spine properly matched, which happens to be easier to achieve and more forgiving at that FOC.