heavy spined arrows
 

I was just thinking about some of these new bows posting 350+ fps ibo ratings and was giving some thought on what arrows some would use at the 70# 30"+ range.Most arrows on the market just won't cover it for perfect spine match for broadhead tuning,then I remembered that Easton has some new big game FMJ's out.

So I went and checked them out and I was floored at the weight some could build these things up to without doing anything special.Check out some of the specs.

http://www.eastonarchery.com/products/product/58

Take a 30" draw and that would be somwhere around a 29" arrow,the new FMJ .250 weighs in at 17.2 grains.

17.2 X 29"=498.8 RAW SHAFT[:o]

125 grain broadhead
75 grain EASTON HIT insert(no aftermarket acc.)
20 grain tracer nocks
8 grain feathers (my preference)

so

498.8
+125
+75
+20
+8
---------
=726.8 grains

With very little work,you could bump this even more but this is just using available easton acc. wow.

RE: heavy spined arrows
 

That would be some serious penetration.

RE: heavy spined arrows
 

I think at 30/70 most of the .300 spine class shafts should still prolly be OK- assuming 100 grain points and vanes around 29" of shaft. Good nock travel on all these hybrids and binaries these days should make it a bit less critical.

Now at 80/30, then it's gonna be tougher. That FMJ and I think CT has a "dangerous game" version of the Rhino that spins in the .200s Some of the larger diameter Goldtip shafts are really heavy spined too...250-ish.

Many of the guys over at the PSE forums are saying the Xforce tends to like a little weaker shaft than you would think (?)

You can always buy some CX insert type carbons then find some old AFC 2540s pultrudeds and stuff 'em inside the CX- thats what a couple guys I know did when they went to Africa about 10 years ago. 1000 grains or thereabouts.... :gulp: :gulp:

RE: heavy spined arrows
 

According to some that have tried to tune broadheads with these faster bows,they are right on the edge at 30/70 and that goes right along with what Archers Advantage tells me.

Go any past 29" arrow or 30" draw and you are in trouble.

RE: heavy spined arrows
 

If field points group great at all yardages, the bow is tuned well, but the BHs wont, group/fly then I'd say it's not weak spine thats the issue but the speed, or the arrow themselves (poor quality)

RE: heavy spined arrows
 

Jeff,I made a slight correction to my post.You just saw it before I could change it.

RE: heavy spined arrows
 

I see that-

Well, unfortunately I don't nor will I ever have any experience with a 30" draw length [:'(]

IIRC, There's a guy over on the ELite forums shooting the XLR at 32" draw 70 pounds or so shooting .300 spine Rhinos- around 30" arrow length . XLR @32" is same power stroke (8" brace) as Xforce or 82nd @ 30" (6" brace). So I'd say it alot of it "depends"- how much FOC? How much fletching weight on the back end to stiffen spine? etc.

Personally, at those speeds and draws, I wouldn't be bothering with fixed blades for deer - I'd be shooting a 3" cut 4 blade mech!

RE: heavy spined arrows
 

DUDE a 750 gr arrow? Holy SH**. I think the African locals already developed something similar for taking down big game -- its called a spear :D:eek:. Would like to see some speeds of a 70/30 82nd, Monster, or Xforce shooting one of these 700gr. javelin's.

RE: heavy spined arrows
 

You and me both.[8D]

RE: heavy spined arrows
 

They also have the .300 dangerous game fmj's weighing in at 15.5 grains per inch.That would be a 449 grain raw shaft[&:]

RE: heavy spined arrows
 

I can say that I tried my 82nd at 70 lbs with a .300 spined arrow, and had to trim down the arrow to 28" and back it down to 68 lbs before I got completely satisfactory arrow flight.

RE: heavy spined arrows
 

Glad you posted,because it was your bow that I ran through AA and it took exactly what AA said for it to be right with broadheads if my memory is correct.

RE: heavy spined arrows
 

Ive seen it lol! and so has TFOX... At the shop, we have an Xforce GX treestand model. @80#'s it shot a 470gr. arrow at 317fps[&:]@29" of draw. At 70#'s it was still in the high 280-290 range but i forget exactly what it was?

That equals roughly 105#'s of KE[:-]

The same bow/arrow setup with weight tubes in teh arrow shot a 720gr. arrow @ 240ish fps.

Sorry my #'s arent exactly right, but its been a while, and TFOX can vouch for me on this one cuz he saw it!

I took the bow hunting the next day after we figured out all of the speeds/ke etc. Needless to say, i was equipped with 2 3/4" trophy ridge turkey tomahawk bh's. I wish i would have gotten to shoot something lol! It would have been ridiculous!

Derek

RE: heavy spined arrows
 

I think darren is shooting it at 110 ft/lb ke.


I will be willing to bet that he is underspined and no way could he get fixed blade heads to fly,BUT,I doubt penetration would be an issue.[&:]

BUT,I did see the chrono but I have not checked the actuall poundage or arrow weight.

RE: heavy spined arrows
 

I did double check the draw weight and arrow weight. They were spot on! IT is a true 80# bow[&:].

Its a rhino bow:eek:

RE: heavy spined arrows
 

TFox this thread is pretty interesting since I'm experimenting with ultra heavy arrows myself. I tried to build the arrows based on the recommendations from theAshby reports.In order to achievean FOC of at least 19%, I had to use quite a stiff shaft that could handle all that weight up front. I ended up with 26.5" Axis FMJ 340's with 4" helical feathers, 100grain brass inserts, and 160grain Grizzly BH's with 100gr steel adapters. Total arrow weight 675grains:). It's for my 82nd set at 54# and comes to about 12.5gpp.