Quote:
Originally Posted by cjottawa  Quite the contrary, even a barrel with an under-bore control segment and an over-bore tip segment is much more efficient than just the control segment.
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yup, exactly right. a freak back isn't as efficient as a freak kit with a front. same for any other barrel system. up to between 12 and 16" depending on bore size and gun breech pressure you're gaining velocity - even with heavily ported, overbored fronts.