Should I be using 100 or 125 grains with this setup?

[Maydar1]

Hoyt Trykon 29"draw. Set at 65lbs shooting 280fps. I shoot Blackhawk Vapor 4000. Thanks for the help.

[JacknCoke]

How long are your arrows?

[glockman55]

Hoyt Trykon 29"draw. Set at 65lbs shooting 280fps. I shoot Blackhawk Vapor 4000. Thanks for the help.

If you shoot 280 fps. My guess is that you use 100 gr. field points now, If so why change? Go with 100 gr. broad heads.

[SwietsRick]

If you use a heavier broadhead it will in effect weaken the arrow and therefore you will need to increase your spine. If you use a lighter broadhead you will in effect stiffen the arrow and therefore need to decrease your spine