Bare shaft tuning - Kansas

I have never attempted to tune arrows by bare shaft tuning. I usually just went by the Easton arrow chart, cut the arrow to an inch past draw and put 100 grains on it. I ordered a PCH and I'm tuning arrows by bare shaft on my old bow so i can be ready to do the same when my Black Widow arrives. The bow I'm using is 48# at 27 inches. I started with full length (30.5 inches) 500 spine gold tips at 7.4 gpi. Starting with 100 grain points at ten yards i hit knock left, over spine, (I'm lefty) until i got all the way to a 250 grain point. These shot straight but left my FOC at 23%! Am i missing something? That much weight up front seems crazy. Any ideas?

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Re:

Mike Bolin
June 27th, 2013 06:06:43pm

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I am in the same boat as you. I shoot just a few pounds heavier that you and I get excellent bare shaft flight with a .400 spine carbon cut 1" past my draw length with a 100 gr. brass adapter and a 250 gr. field point. Tinkering around this evening with a .500 spine with a standard aluminum adapter. Fly like darts with a 200 gr. point. Every chart I have referenced show I have way too much weight up front, but the results don't lie. I shot the IBO shoot at Farmland last weekend and had a guy comment that I was getting the best arrow flight that he had ever seen. Weird, but I am good with it as long as I am getting good flight! Mike

Re:

Kansas
June 27th, 2013 08:06:31pm
Thanks for the info. I was thinking i was way off base somehow but like you said, the results don't lie. How can there be such a disparity from what these charts tell you and what a bare shaft does in flight? I suppose the charts are designed just to get you in the ballpark. Do you ever use a full length arrow, lighten up in front and add weight to the knock end in order to adjust your forward of center balance?

Re: bare shaft tuning

Willie
June 28th, 2013 05:06:35am
kansas if your shafts are tail left and you have 250 grains up front they are to stiff UNLESS you want to shoot that much FOC. bare shaft tuning is the way to go IMO.the closer you get it the farther you can shoot bare shafts.i shoot mine up to forty-five yards and i can put it in the kill area of a 3-d target.make sure you are pulling bow back all the way and be the same each time.money well spent are the brass weights that screw into the inserts as you can shoot a variety of broadheads.here are some examples: 1. insert=38 grains+150 grain point+one 50 grain insert+one 20 grain insert= 258 grains (same set-up but with different point) 2. insert=38 grains= 125 grain point+50 grain brass weight+two 20 grain inserts=253 grains hopes this explains it to you.

Re:

Animal
June 29th, 2013 07:06:10am

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Try Stu Miller's Dynamic Spine Calculator. It gets em pretty close on bare shaft tuning. I shoot 20% FOC out of PA and PSA. No problems.
Kansas
Mike Bolin

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Kansas
Willie
Animal

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