could that be the reason why some days, i will shoot great, and others i wont????

No, and I thought we came to the conclusion that you were not underspined? TFOX probably ran it in a spine program to check, or he has experience with that arrow and knows how they react to different set ups. You cannot go by those charts, even when you feed them the correct info they are still off most of the time.

Since they don't ask what your draw length is they base it off your arrow length. If you tell the chart or table or simple online calculator that you have a 27 inch arrow it assumes you have a 28 inch draw length, which you don't. So in essence your bow is putting out much less power than the chart thinks it does. If you want to shoot arrows that are not of the proper length you either have to know the charts really well or use a program that takes into account your actual draw length and arrow length. I used to have On Target but I got a new computer and haven't tried to re install it yet to see if it will work or I would run it for you.

But again, the simple answer to your question is no. Shooting good one day and not good the next is do to poor form, inconsistent shooting technique, target panic or any of these combined. If you had poor spined arrows it would consistently shoot bad. And to be honest with field tips it would probably still shoot really well if you had good form. Broad heads are where your nightmares would start.

Paul

You are not underspined.

Exactlty Paul

OH, i mis understood in your other post TFOX, mybad, thanks for clearing that up for me.