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In 10mm, you will typically gain about 100fps AVERAGE, going from a 5" to a 6" barrel.... depending on bullet weight and other various factors. For example, a 135gr pill might gain 150fps or more while a 200-230gr bullet might only gain 40-50fps. That has been my experience. Either way, its substantial enough to consider, especially if using the 10mm for hunting.
 
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