Spine question for 45# bear grizzly

[Hunt4Jesus]

I pull around 27 1/2”, but was wandering what arrows length and spine and head weight I should be using. String is prolly the stock custom string on it. It is the older green/dark wood one piece. Thanks

[tradtiger]

Lot of ways to go, lot of factors to consider. Best answer, generally speaking, that I would offer is try a 400 spine carbon with 125 grains on the front. Start cutting from the rear in 1/8" increments until it flies right.

Understand that you can drastically change your approach within this framework: you could put a heavier head on or use an insert in the front. Also, know that I built really heavy arrows (680 grains, with 28 % FOC, cut at about 31-1/2"), but found that I needed to go up to a 70-lb bow to get them to a good speed.

[DRT]

Try the 3Rivers spine calculator first. It should get you close.

https://www.3riversarchery.com/dynamic-spine-arrow-calculator-from-3rivers-archery.html

Gary

[Bisch]

Spine question for 45# bear grizzly

If your draw length is 27.5”, then your actual draw weight will be about 43# or so. If you went with a .400 like suggested above, you would have to leave it full length, and have 300+gr up front to make it tune correctly. .400 spine is likely too stiff to be practical for a 43# bow, esp an older bow that is likely not cut to center.

You could go with a .500 and somewhere around 200-250gr up front (insert and point weight combined). Or you could go with a .600 and have less weight in the front.

Like stated above, whichever shaft you go with, start with full length, and play with front end weight and length in small increments till you get it right.

Bisch


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[Dkincaid]

Bisch nailed it


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[Hunt4Jesus]

Sounds good according to the calculator it’s saying 500 spine. I will begin to start and see which works best. Thanks

[BowBuddy2]

I shoot a 43# recurve and have a 27.5” draw length.
Here’s what I did, using Gold Tips
Tuning Gold Tip Arrows to a Black Widow PSR Iron Wood Recurve Bow for Archery and Bow Hunting https://youtu.be/q4Mqwi3gqxc


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[El Paisano]

1816 or 1916 aluminum...

[Jon Stewart]

I shot a bear last year with a 45# Bear bow using 29" 1916's with a 125 grain Black Diamond two blade head. Arrow flew like a dart.

[muddydog]

I would recommend 500 spine for your setup, I shoot 50# using 30" gold tip 400 with 300 grain tips.