Full Metal Jackets - Amazing

[abcwarrior]

I think I see.

The 30" arrow length specifies 340 spine at 333 grain weight in the Easton software, whereas changing to 29" length, the 340 disappears replaced by 400 spine (287 grain) as you recommended.



Query: 29" selected.

You mention 125 grain points as standard, changing to 90 grain if struggling to reach 90m distance.

The Easton selector agrees with you at 90 grain point, but when you select 125 grain points, then the 400 spine disappears, replaced by 340 spine again.

What are your thoughts, as you seem pretty respected around here!

400spine, 287grain + 90 grain point = 387 grain arrow (ish)
400spine, 287grain +125 grain point = 412 grain (out of Easton "spec)
340spine, 322grain +125 grain point = 447 grain arrow


I'm certainly not pitting you against Easton, I am just trying to understand more about the thinking behind various choices.


Many thanks,

Ivan

[pwiles1968]

I would trust a recommendation from Marcus over Easton Charts If you are in the Hunting section then Easton spine a little heavier, unfortunately they do not put the Axis FMJ in the Target section but if you look in there at another arrow that is in both Target and Hunting, you should see that the same arrow with the same bow setup is spined higher for Hunting, I don't know why.

Also check to see how much overhanging arrow you have over the end of your rest, if you have more that and inch you can afford to cut your arrows down less than 29" this will stiffen them up.

[abcwarrior]

Originally Posted by pwiles1968

I would trust a recommendation from Marcus over Easton Charts

Cool. I will.

Originally Posted by pwiles1968

Also check to see how much overhanging arrow you have over the end of your rest, if you have more that and inch you can afford to cut your arrows down less than 29" this will stiffen them up.

I will check, thanks for the tip.



Regards

Ivan

[pwiles1968]

Originally Posted by pwiles1968

If you are in the Hunting section then Easton spine a little heavier, unfortunately they do not put the Axis FMJ in the Target section but if you look in there at another arrow that is in both Target and Hunting, you should see that the same arrow with the same bow setup is spined higher for Hunting, I don't know why.

Just had a look, Target and Hunting sections seem to be the same at 60# but they spine differently in the 50-55# range that is pretty weird.

You have a 60# bow is it wound all the way up to 60# ?

[Marcus26]

I didn't say 90 grain point. I would go 110gr then 100 then 90 then a Bowtech if I couldn't get 90m.

Compound is very tolerant to spine changes and changing point weight makes stuff all difference to the resonant frequency of the arrow which determine arrow clearence.
A 400 will come out at about 450 grains which could be a challenge getting the distance. A 340 will come out at about 480 grains which is getting seriously heavy.

Don't spend too much time fussing on arrow spine, it isn't a big deal.

[Davros]

Interested in what you say Marcus. I'm just about to buy a new set and was thinking of going from my current ACC's to Navigators. Now, having read of all the impressive results...
Anybody tried them outdoors yet , that's the test?

Where do you get them and what are they exactly? - I don't understand the term Full Metal Jackets.
Would they be OK for CU at around 45-50lb at 30" single hard cam? -target shooting . What size/pt wt would you suggest?

[Marcus26]

Yeah had shot them outside, shot PB's at 90m, 70m and 50m. Plus PB for a FITA 900.
No issues outside at all.

at that weight I would say 500's would be best.

[iscap_boy]

It's just me, or Easton is only launching new arrows for compounds? FMJ's only work on really strong recurve bows, doesn't they?

[Marcus26]

The Navigator FMJ's will work on recurve too.
They go to 770 spine.

Originally Posted by iscap_boy

It's just me, or Easton is only launching new arrows for compounds? FMJ's only work on really strong recurve bows, doesn't they?

[BowSurfer]

Originally Posted by Davros

...
Where do you get them and what are they exactly? - I don't understand the term Full Metal Jackets.
...

Conventional carbon/aluminium arrows have a thin walled aluminium tube with carbon fibres spun round the outside.
FMJs are a similar construction but inside out - the aluminium is outside and the carbon fibre layers are inside (don't ask me how they make them).
The advantages are that they are more robust and that they will pull out of the boss more easily.
On the basis of their specs they are similar to Navigators, therefore marginally better than ACCs, but still not as good as ACEs judged on weight per inch and on straightness tolerances.


ACE 570 ACC 3-18-560 NAV 540 Nav-FMJ 570
straight +/- .0015 +/- .002 +/- .002 +/- .002

gns/inch 6.3 7.8 7.4 7.8

wt tolerance +/- .5gn +/- .5gn +/- 1gn +/- 1gn