80 lb limbs

Bowtech insanity I'm shooting a axis 340 at about 330 fps would like to possibly switch to a heavier arrow abd keep my speed
 
What info are you looking for? If you want to keep the same speed, you can add roughly 60gr to your arrow weight and stay the same with 80 lb limbs.
 
Jumping up to an 80 pound limb will also change your arrow spine need. The 340 wont work in my opinion you will need to jump up to at least a 300 axis to spine out and tune. Especially if you plan on running a fixed blade broadhead again: IN MY OPINION
 
I'd check with your local Bowtech dealer. They should be able to order you some if Bowtech makes them. I agree with Evan in possibly needing a stiffer spine. My buddy is shooting an 80lb Omen and he's shooting a 200 spine GT out of it.
 
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