asianhunter

i just bought a 05 hoyt vtec 70lbs 27 inch length axis 400 W/ QUICKSPIN VANES i was thinkin about buying nitron broadheads which one is better for my set up, 100 or 125grains thanks!!!

gonzodemon

PERSONALY I WOULD GO WITH THE 100 I JUST LIKE THEM. THEY FLY A LITTLE BETTER FROM WHAT I REMEMBER . I SHOT SOME AT MY LOCAL SHOP . BUT THE 125 SHOT WELL ALSO.

PABowhntr

The 125 grain point may yield a slightly weak spine for that arrow and a 70 pound draw weight...though you could probably get away with it if not given a choice. I think the 100 grain would be better because most bows these days typically shoot better with a slightly stiffer spine.

duckchr

In the case of which braodhead weight, you are not just supposed to choose which one. You want to choose the one that gets you more of a 10% front of center balance.

Put oneither grain head and balance the arrow close to the middle by resting the arrow on your finger. Mark that balance spot and mearsure the length from the front of the arrow to the center of the mark. Subtract that distance from half of your arrow length(in your case 13.5"). Then take that number and divide it by your arrow lenght(27"). Choose which ever grain head gets you closest to (.10). The two will be relatively close but one will be better. In my setup, the front of center distance is 2.6", and the front of center percentage is 2.6/27= (.097) or 9.7%.

I know this is a lot of math but this is the absolute engineering way of choosing a head correctly, not just choosing one on preference. The 10% front of center puts the arrows spine in the most optimal position during launch and flight and maximizes arrow flight stability.

I sort of bring my work philosophy to my bowhunting: "In GodWe Trust, all others bring data!!!!"

PatriotDually

Cool, i never knew that about the 10% thing.

Illinois Bowhuntin

I didnt either.So now I have to go and measure my stuff and see if I am using the correct broadhead.I always used 125 G thunderheads and have now switched to 100 hope I did the right thing.Personally I like the 100 better because my shot are closer and flight is much flatter.Use 1 less pin out to 50 yards now with 100's.

bigbulls

Quick spins are very heavy vanes and you are going to end up with about a 26 inch arrow. The shorter the arrow the heavier the tip needs to be to get proper FOC because the two ends are getting closer together. Especially with vanes as heavy as the quick spins.

The 400 axis arrows will spine out perfectly with a 125 grain head which is definetly what I would choose. You wouldn't need to step up to a 340 spine until you get close to 78 pounds of draw weight with a 26" arrow.

A 125 grain head will give you about 12% FOC and the 100 grain head will give you about 9.5% FOC.

heeze gutshot shortee

ask that dead critter what it prefers.......Any who...good info I gotta check my set up too...used to think 125 was the clincher...now Im not so sure