Here is an easy-to-use calculator I like:
http://www.zknives.com/bali/brcstgn.shtmlThere IS no way to calculate "felt recoil" of course. That's why all manner of charlatans and snake oil salesmen like to use the term. Some legitimate examples of felt recoil being different from true or calculated recoil are: A fixed breech gun such as an O/U or SxS will produce the same true recoil as a gas operated autolader of the same weight. The gas auto will produce less felt recoil, however, because the recoil is broken up into two or three smaller impacts, whereas the O'U is all at once. Two otherwise identical guns will produce less felt recoil if one has a good recoil pad. Better yet, a shock absorbing mechanism like the Air Cushion or G-Squared device. Some prime examples of highly questionable reducers of felt recoil are back boring, lengthening forcing cones and the typical porting that is usually done. None of the above however, is measurable. That's why the term is often just a smokescreen to make the illogical believable.
