Broadhead help for a 40 pound bow help !!!!

[Friend]

Hi Shawn,
Per your inquiry concerning the basis of my offered considerations, I hope the following response alleviates your concerns. Normally, I use Stu’s Calc for focusing on Dynamic spines that have worked with many of my set-ups that are Hi range EFOC or Ultra-EFOC. The differences in the dynamic spine and the bows-arrow required spine may be in the 25# range. His system seems quite accurate for normal and lower range EFOC.

Just a recent example:
I have 350 shaft w/350 gns up front that bare shafts nicely at 25 yards.(51@ 28 – 30% Ulta-EFOC). Stu’s calc yielded that a 225 gn(24%-EFOC) up front on the same 350 shaft should put me close. This set-up too, also bare shafts nicely at 25 yards w/o any modifications.

Per Stu’s Calc which actually has the Samick Sage listed:
***The 1st possible consideration using Stu’s Calc yield an Arrow spine 60.1 vs 61.3 Bow-Arrow Dynamic spine required spine***
Length - 27.5
100 gn insert
200 gn pt
tot arrow wt -487
12.3 gpp
29.2% FOC

and

***The 2nd possible consideration using Stu’s Calc yield an Arrow spine 61.4 vs 61.3 Bow-Arrow Dynamic spine required spine***
Length - 28.5
50 gn insert
200 gn pt
tot arrow wt -444
11.2 gpp
26.4% FOC

My area of uncertainty, besides the reality performance, is that I have never dealt with such a short arrow that seems to naturally permit such hi FOC by utilizing arrows with low gpp to spine ratios.
 
Best regards,

Friend

[Shawn Leonard]

Sorry but Stus calculator has been useless in all my testing and for many people when it comes to high FOC. When I plug the data in from my arrow set up he has me at 30#s underspined and I get a perfect tear at 12-15ft. and my bareshafts are perfect as well. If I followed his chart for any bow I own I would be 25-35#s overspined. Been doing this a lot of years with carbons and I can assure you most guys I have seen shoot in person are overspined with carbons. If a person gives me all the info on there bow and drawlength, poundage etc. I can get most on the money and I do not need a calculator, I use actual real world experience. Nothing against Stus calculator if yoy like it and you feel it works, that is wonderful. Just not for me. I also can tell you a 350 out of a 75# Silvertip at 28.5", cut to 29.5"s needed 350 up front to get perfect flight. Sorry but I would bet dollars to donuts that the 350 you are shooting is stiff. Sorry don't want to hyjack thread but I shot a Sage very recently and it was 53#s at my draw and a .487 spine cut to 29.5"s with 225 up front flew perfect, plug that in and Stu will say I am 25-27#s underspined. Shawn

[RLA]

I will say Stu's calculator shows me 20#s under spined, but that's not the case at all. So many things to take into consideration.

[straitera]

2-blade razor sharp!

Using tapered cedar shafts and either Zwicky two blade Eskimos or 125 grain Grizzlies, my wife, with 38 at 26 inches has only had once that the arrow did not either pass through or dangle by the feathers and fall out the opposite side.  The one time she did not get two holes was on a deer that jumped the string and got hit in the back right rump, the arrow stopped in the far left shoulder blade and stuck nearly an inch into the shoulder blade, that was with a right wing Grizzly file sharpened on a left wing cedar shaft. i don't even want to get into what happened with her [email protected]" draw with her new Lost Creek NAT, the magical vanishing arrow trick, that was an Eskimo that was shaving sharp.

[Zradix]

   

[SS Snuffer]

This works for me!

[lunchbucket]

I will make it a point to check out those zwicky and grizzly broadheads. It seems a lot of yall have had great success with the.