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Old 28th November 2015, 06:43 PM
Ceathreamhnan's Avatar
Ceathreamhnan Ceathreamhnan is offline
WHFTA Champion 2013
Join Date: Nov 2011
Member of: Dunfermline
Location: Stirling
Posts: 640

I had this problem in early 2013. It turned out the carbon sleeve was very slightly banana shaped. As you rotated it it would push the barrel in different directions (even though it felt free), or if it stayed in the same place, the different length of expansion in the sleeve versus the barrel produced a unpredictable zero shift due to temperature variation.
That's why I shot the 2013 worlds with the barrel wrapped in electrical tape

If you roll the sleeve along a very flat surface like a kitchen worktop you should be able to see the runout as part of it goes up and down.
It's the Indian not the Arrow
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