Deep Six FMJ FOC concerns

[Hunthigh1]

The current FOC on my Easton arrows

4mm deep six fmj with 100 Grain tip = 9.075%

5mm fmj from last year with 125 grain tip= 10.221%

I know easton recommends 10-15% FOC

I am wanting to shoot the 4mm arrow this fall, but am concerned about that FOC being too low.
With limited options for 125Grain deep six broadheads, I would like to stick with 100 Grain heads. . .

What are the best ways to up my FOC on this arrow? Is there a preferred insert to bump this up?

Do i have to just add a 2nd insert behind the existing one? any better options?

 

[jmez]

As far as I know no one has come out with any weighted or heavy Deep 6 inserts. You have to just add a second insert.

 

[Hunthigh1]

darn it! I wonder if adding another insert behind the existing one will even be enough weight to get that FOC above the reccomended 10%...?

 

[Tex68w]

Let us know how those 4mm FMJ's shoot for you, I'm definitely interested.

 

[justin davis]

When i shot deep 6 4mm arrows I used 2 inserts in them and 100 grain point.

I now shoot the Goldtip Pierce arrows and like that arrow better

 

[go4thegusto]

I buy 1/8 inch brass rod at menards and cut to desired weight length. Epoxy in behind insert.

 

[Muley15]

Building an FMJ with really good FOC isn't really possible without getting really heavy.

 

[Pramo]

I've run into a similar issue with 330 injextions and trying to get good fixed blade flight and better foc. I originally made the arrows with one insert, blazers and no wrap to keep a decent foc. Then I had trouble with larger exodus heads past 40 yards and I was at 282 fps although I could get Wacem flying great.

Now I moved to Max Stealth vanes with a wrap to stiffen up the spine and double inserts at 270 fps with great flight to 60 yards with exodus. I added the second insert from the rear of the arrow after making a tool from a wire and shrink tubing to push it in. It can be a pain but with a little care they will go in and not pull out, you can then look though the shaft to made sure its sitting correct before the epoxy drys.

 

[Hunthigh1]

I've run into a similar issue with 330 injextions and trying to get good fixed blade flight and better foc. I originally made the arrows with one insert, blazers and no wrap to keep a decent foc. Then I had trouble with larger exodus heads past 40 yards and I was at 282 fps although I could get Wacem flying great.

Now I moved to Max Stealth vanes with a wrap to stiffen up the spine and double inserts at 270 fps with great flight to 60 yards with exodus. I added the second insert from the rear of the arrow after making a tool from a wire and shrink tubing to push it in. It can be a pain but with a little care they will go in and not pull out, you can then look though the shaft to made sure its sitting correct before the epoxy drys.

Pramo, Your a genius! putting another insert in from the rear is going to save me some cash!

 

[Whisky]

I now shoot the Goldtip Pierce arrows and like that arrow better

Can I ask why? Is it the insert system or all carbon arrow? Been thinking about making the switch my self.

 

[jmez]

Building an FMJ with really good FOC isn't really possible without getting really heavy.

Which is another advantage of shooting FMJ's!!

 

[Brendan]

250 spine GT Pierce platinum - 28 inches vs. 280 spine 4mm FMJ - The GT will be 60 grains lighter than the FMJ at a stiffer spine (Arrow / Carbon weight only). Allows you to move all that weight up front to get the same overall arrow weight, better FOC.

 

[Pramo]

One tip on the insert is turning it around so the smooth side is last in, this will help keep the epoxy on place

View attachment 46756

View attachment 46757

 

[Muley15]

Which is another advantage of shooting FMJ's!!

Not sure how thats an advantage unless you want an arrow pushing 550g.

 

[theleo91386]

I'd just shoot it and not tell my bow that the FOC is off by 1%.

 

[jmez]

Not sure how thats an advantage unless you want an arrow pushing 550g.

Why I see it as an advantage.

 

[Hunthigh1]

I'd just shoot it and not tell my bow that the FOC is off by 1%.

That was the plan, until winter boredom set in with serious gear over-obsession

 

[Hunthigh1]

Not sure how thats an advantage unless you want an arrow pushing 550g.

Some of us like a 500grain class arrow. I dont mind bigger pin gaps and am always stressed about getting great penetration.

 

[Brendan]

Some of us like a 500grain class arrow. I dont mind bigger pin gaps and am always stressed about getting great penetration.

But, a 550 grain arrow with more FOC is better than a 550 grain arrow with less when it comes to penetration and forgiveness (As long as spine is stiff enough to support it...)

 

[justin davis]

Can I ask why? Is it the insert system or all carbon arrow? Been thinking about making the switch my self.

They are tougher. I like the all carbon vs the aluminum carbon. Lighter shaft and I'm able to get better FOC with them.

Also their insert system is nice. I can shoot normal heads and not deep 6. But still able to shoot and reap the benefits of a skinny arrow. I have had no issues with it. I like that I can add weights into it with the Fact module system. My arrow right now weighs 450 and has 18% FOC.