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340 or 400 Spine

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My set-up: Switchback XT, 60 lbs., 27.5 dl, 100 grain broadhead. Would like to shoot a 27.5 inch arrow. Would you recommend a 400 or 340? I have always shoot 400 before and have struggled at times with broadhead flight.
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· ArcheryLessonsOnline.com
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My set-up: Switchback XT, 60 lbs., 27.5 dl, 100 grain broadhead. Would like to shoot a 27.5 inch arrow. Would you recommend a 400 or 340? I have always shoot 400 before and have struggled at times with broadhead flight.
400 spine.

-Adam
 

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Based on my software a 410 static spine is ideal with a 100gr tip. 400 would be fine. What vanes our you using. Leads me to think maybe the arrow is stabalizing correctly. Just a though....

Also can we get some info on what arrows you are using?
 
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