Well i have built 4 different sets of arrows in four different weights and shot them through my chrono. Here are the results from the testing including the FOC of the arrows..
Now the 845 grain arrow seems to give the best all round mix of speed and momentum.... but because of the heavier shaft used (easton fmj dangerous game 300) the FOC "drops" to 17.76

with the 735 grain arrow the FOC is higher and into the EFOC range at near as 21%

When we are talking about such weights of arrows travelling at such good speeds is FOC as critical (all my FOCs are well above the "good ol" 12-15% range so give very good flight)

So my question is, in your (or others experience) which arrow would be the better choice for say big wild pigs, african game up to eland etc....

Would the heavy  937 grain arrow in your experience be good enough for example buffalo?  O.66 slug is quite a bit of momentum...
(broad heads are 250 grain woodsman elites or the big nanook single bevel)
here are the numbers:
 

Here is a graph showing the momentum...
 

And here the KE
 

are you guys on the MIT archery team.

Blujeger,

FOC is a huge factor in penetration, Increases in FOC provide dramatic increases in penetration.  The 735 grain arrows will blow thru anything your going to shoot at and will penetrate on Buffallo as well.  I would stay away from the Nanook.  I would look for a single bevel two blade with a 3 to 1 length to width ration to optimize your penetration.  There are several on the market that are close to these dimensions.  

The Ashby reports identify the issues and improvements for arrows.  The FMJ's have a small shaft diameter that will also help with penetration.  Nothing wrong with shooting the heavier arrows for buffallo.  They seem like dramatic overkill for everything else.

Ed hasn't been in the best of health lately so you may not hear from him for a while.

Hi Nathan. Ultimately, use what gives you the most confidence. That notwithstanding, your 580-grain arrows going 193 fps is more than enough to blow through any game species in North America. You should have absolutely no problem killing hogs with it.

May I ask what bow, poundage, draw length etc you are using out of curiousity?

If you can get the regular Axis 300's to tune the same as the FMJ's then it would make for a better equation to get higher FOC with the lighter grains per inch.  I would try those and see what I came up with.  You can foot the Axis internally or externally to toughen them up also.  At about 12 grains per pound is where you can expect to get the best performance out of the bow and arrow combination.  Above that I think that your performance will drop off.  With that all being said, I think that you will do well with the 735 grain arrow.  If you could find a lighter arrow still and go up in spine and then up in point weight then you could get a higher FOC and stay around 12 gpp.  Hope that this helps.
Clayton

QuoteOriginally posted by Bob L.:
May I ask what bow, poundage, draw length etc you are using out of curiousity?

Look on the first line of the chart in the post at the top of the page. It gives all the information you are asking for.

Allan

I think your effective range will be 15yrs with such a heavy arrow!!try your 580 gr set up the others are overkill  10 to 12 gr lb is perfect

Any of those combinations will do the job if you do yours. My guess is you will be happier with 1 or 2.

Hi folks, and thanks for all the answers  

All of the arrows shoot and group well. No problem shooting out to 25 yards with the monster 937 grain arrow point on at 25 yards due to the fact that it is full length 32.5 inch .250 spine fmj dangerous game shaft...
The 845 grain arrows give me a point on of just under 30 yards and group really well, the bow really seems to like these....
The 735 give me a point on of 35 yards and the lightest arrows give me 40 yards point on.... So all arrows give me more than enough range for hunting.

As far as browadheads are concerned.. I am hopefully going to get some testing done at the local slaughterhouse some time this winter... I know the farmer who runs it, so some dead pig shooting with heavy bone hits on purpose will have to be done  
I use silverflames generally, but they max out at 210 grains and I need something heavier for arrow 2, 3 and four....
I have ordered a set of nanook, I have some 250 grain woodsmens and I have ordered some 150 grain grizzlys with the 100 grain steel adapter...
Any other suggestionsin the 250-300 range?
(I prefer 250 simply beacause its the heaviest field tip I have found and I can shoot on the clubs 3D targets without any bother, giving me good varied practice....at home I can shoot broadheads though..)

QuoteOriginally posted by Jason R. Wesbrock:
Hi Nathan. Ultimately, use what gives you the most confidence. That notwithstanding, your 580-grain arrows going 193 fps is more than enough to blow through any game species in North America. You should have absolutely no problem killing hogs with it.

Hi jason!
Not regretting selling the riser to me then?     I am really enjoying it and the what can I say about those Border limbs I put on it?... mmmm

Yep that 580 grain arrow really moves! but I really like the idea of the heavier arrows.. I think I may end up using the 735 for general hunting, knowing that for africa next time I have the option of two heavier arrows that fly really well....  
Nathan

QuoteOriginally posted by vermonster13:
Ed hasn't been in the best of health lately so you may not hear from him for a while.

Not good, I hope he has a speedy recovery.

best regards,  Nathan

Blue..
190 gr. Grizzly with 125 gr. adapter gives you 315 gr.
For field points use 190 gr. glue on point with 125 adapter.

Now why didnt I think of glue on field points with adapters.. that gives me a whole new world of choices!
Thanks  

My 190 Grizzly broadheads ended up around 175 grains after I cut the bevel down to 25 degrees (The bevel the Grizzly heads come with is poor at best).  I used a 125 grain adaptor for a total weight of 300 grains.  You can get 300 grain field points from Kustom King Archery.

buejeger,
There is a small area of space in the ferrule of the point above the adapter.  It is waisted space IMO. I get lead worm weights and use pliers to pinch off 10-15 grains.  I drop the piece of lead down in ferrule before glueing adapter. Now I have added 10-15 grains in the ideal location...as far out in front of the arrow as possible.