FLbowhntr

Are GT ultra light pro 400's 27.5" long out of a drenalin at 70 pounds and a 27.5" draw length ok, these are what I'm leaning towards.

bigcountry

I show it a tad on the stiff side unless you use a 125gr tip, and use only a 10gr nock. If you use a bushing pin nock, thatsan extra 12gr on the nock endalso, then its too stiff. If you use a 100gr tip, then a little stiff.

If you cut the arrows to 28", and only use 10gr nock, with 4" duravanes, with a 15gr insert, 100gr point, then they show just right.

FLbowhntr

Thank you

davepjr71

I'm showing those arrows asunderspined for hunting but ok for target for your set-up.

bigcountry

Dave, what numbers are you using? Seems our programs work totally different.

bigcountry

Here's the setup

davepjr71

I think the difference is from what type of fletching we are using. I used Blazers and you used full sized fletching. This shows how using different fletching changes spine. Your arrows have more grains on the back which would increase spine. That's something people should pay attention to and why I created the thread asking people to give all of the info they have for their bow. I'd bet if we had a chronographed arrow from his bow the arrows would be stiff with the Blazers.

davepjr71

other screen

bigcountry

Ok, that makes sense. I usually always use 8gr each for duravanes, etc. Also, I use 80% letoff, and 8gr bohning sig nock. Guess it all added up.