Stu Miller Dynamic Spine Calculator help

[Ty]

I have been shooting traditional archery for about a year now and have made tons of improvement with lots of practice and the trad gang forums.  I shoot a bear grizzly, 50# at 28 inches and my draw is 26 inches.  The arrow I’m using is a 3 rivers Trad Only 500 cut to 28 inches with a 125 grain point.  If I use the Stu Miller Dynamic Spine Calculator it shows that this is to stiff by a long shot but when shooting it bare shaft the is nock high and straight on.  Please help? What am I doing wrong?

[saumensch]

Have you compared the grouping of bareshafts and fethered shafts? Nock position lead me always wrong, comparing groups was most of the time spot on with stus calculator.

That said, i am by far no expert for arrows, so it is just my humble little experience.

[cbCrow]

I used to be a proponent of bare shafting but since using the "Calc" I find that it is right on 99.5% of the time. I actually tryed to prove it wrong by    bareshafting and comparing. It was so close I thought why go thru all that work if their is a shortcut. When you get up in years you use shortcuts!

[MSwickard]

Ty

Punched your numbers into Stu's and it seems they are way stiff.  However, when bare shafting you really need to compare it to a fletched shaft.  Don't worry about the nock position.

First off, if you haven't cut all your shafts yet, I'd shoot a FL bareshaft with the point weight you want to shoot.  Are you using screw-in points or glue on with adapters?

Compare the fletched shaft with a bare shaft to see if the bare shaft groups with the fletched.  Once you get this to happen you can fine tune the shaft from there.

Once I get the bare shaft grouping and shooting where I am aiming, I will start taking a little cuts off the shaft to stiffen it up so that it will be very slightly nock left.  Adding flething will stiffen it some.

Mike

[Ty]

Thank you for the quick response!  I am going to get some new shafts that Stu’s recommends and use the bare shaft compared to the fletched shaft method.  Ones again I really appreciate the help!