If you're comparing the accuracy of a wrist strap release to a T-handle (back tension) release..... there simply isn't a comparison to be made! The Back tension releases have long dominated every aspect of tournament archery and proven to be the most consistent and accurate releases in the world!
That being said, it can be difficult and intimidating for some folks to learn how to shoot one but once they do...... they will be a better shooter for life. Even the guys that shoot wrist strap releases often switch to a BT release from time to time just to keep that level of muscle memory, accuracy and consistency.
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