Arrow setup question

[wbyrd]

Need a little help here guys.

Bear Kodiak 40# @ 28 drawing 28"

I bought some Victory 400 (.400 deflection) arrows cut to 29". According to Stu's calculator I need about 270gr point weight to get in the ball park. I've got some bear razorhead glue-ons that I want to use. But I also have some screw-in Magnus 125gr stingers along with some small game heads that I would like to be able to use too.

Would it be best to get aluminum adapters for the bear razorheads and use adjustable weight modules to get to the weight I need for the arrow to tune? This would allow me to be able to use the stingers too. Or would it be best to get a heavier adapter for the razorheads, use standard inserts, and just not be able to use the stingers?

[AKM]

I sure ain't the most knowledgeable guy here but I would think that you will need more than 270gr up front to get a .400 to shoot correctly out of a 40# bow. After you weigh the front of the arrow down as needed, you will more than likely have something that nose dives too much to make it worthwhile. Maybe I am wrong. Good luck.

[wbyrd]

According to Stu's calculator my bow requires a dynamic spine of 51.6lbs. The Victory arrow cut to 29" with a 145gr point and 127gr insert weight (7gr insert plus 120gr from adjustable weight modules) and 9gr on the nock end is 52.6lb dynamic spine. Total arrow weight is 523gr.

I don't believe this is too much for my bow, but I could be wrong.

Please let me know if I am!

Thanks.

[ishoot4thrills]

Make very sure that you enter the exact center shot measurement for your bow. In my opinion, it's the single most neglected, yet most important entry of all for the calculator to work properly. I usually lean toward trying the weaker spined arrow and build out the strike plate of my bow to cause the arrow to act stiffer. Unless of course you are wanting EXTREME FOC.

[wbyrd]

Good point on the center shot measurement. I just put a bear weather rest on the bow last night and it's seems to stick out quite a bit further than the strike plate did. I double check that for sure.

[JRY309]

That still sounds like too stiff an arrow for a 40#@28 bow.I have a 45#@28 Bear Grizzly drawn to 27" and I shoot a GT Entrada 600 out of it.And they shoot just great and flat.A .400 spine arrow is a stiff arrow for a 40# bow to me,from my experience.

[AKM]

You will need to bring that arrow as close to your riser as possible because of how stiff it is. I think you will still have a very stiff arrow no matter how close to the riser it is. A .500 would have been a better choice IMHO.

[wbyrd]

Well, I was going for a pretty high FOC arrow. The way I have it in the calculator it's 24.6%. Is this too much?

How about my questions regarding the best way to achieve higher weight in the tip? Any opinions on this?

Thanks.

[Night Wing]

I will probably get catch some flak for this, but there are alternatives even if the alternatives aren't well received.

Personally speaking, since I shoot low poundage bows, I don't think a very high 24.6% EFOC is the way to go for a 40# bow since more than half of your arrow's 523 grain weight is at the tip (270 grains) because you're shooting a carbon arrow. I think a heavy arrow GPP wise is better than a very high EFOC for a light poundage bow of 40# although your GPP is (13.07). The way to achieve a heavier arrow could be with shooting an aluminum arrow.

Look at both of my bows. I shoot aluminum arrows. Notice the GPP is very high, but the FOC isn't high. That's because only 1/3 of my arrow's overall weight is at the tip. But, look at the overall arrow weight from the arrows I shoot out of my 42# and 37# bows.

Blacktail TD Recurve: 66", 42# @ 30". BS: 12StrDyna97. BrcHt: 7.562". Arrow: 32", 2117. PW: 200 Grains. AW: 637 Grains. SPD: 153 fps. GPP: (15.16). FOC: 15.4%

Blacktail TD Recurve: 66", 37# @ 30". BS: 13StrDyna97. BrcHt: 7.687". Arrow: 32", 2114. PW: 180 Grains. AW: 550 Grains. SPD: 155 fps. GPP: (14.86). FOC: 16.2%

So, if you want a heavier arrow, have you considered an aluminum arrow?

[TKO]

I read one of the Ashby reports where a 40# bow with an ultra EFoc arrow out performed an 82# bow shooting a similar weight arrow with lower FOC.

I have to admit, after reading several of those reports, I am going to set up my arrows with at least EFOC if not  ultra EFOC.

[David Yukon]

Realy interesting thread!
Keep'em comming!

[AKM]

I think the biggest field point that Three Rivers sells is 300gr. I think if you really to try and make a lightweight .400 work, you need an Easton Axis, Beman Classic, Gold Tip, etc that you can put a 100gr brass insert in and leave it at least 29.5" or maybe even 30" and then add your very heavy field point.

[onewhohasfun]

No such thing as too much weight up front. Go for it.

[Apex Predator]

I agree there is no such thing as too much weight up front.  I'm not thinking you can find enough weight though to flex those .400s. If they were full length, and you had 100 grain brass inserts and 300 grain heads, they would be too stiff for me.  Stu's calculator has never been close for me though, cause I'm weird!

[Stone Knife]

I would try some 1535's with standard inserts and your 125 gr points. They will come in around 425-450 your trajectory will be much better.

[wbyrd]

Any preference in whether to get the weight I need from heavy screw-in broadhead adapters or the PDP weigh modules?

[Encino Man]

Well.... The weight modules would allow you to test different weights more easily for tweaking purposes.

[DannyBows]

If you use heavy adapters you won't be able to use the Bleeders with the Bear's, if you wanted to, they cover the slot. If you use the PDP's and find you still need more weight up front, you can use 75 grain adapters in the Bears and still have the option of using bleeders. I agree with Encino Man, the PDP's give you more options.