I know quite a few people on this forum who are as nuts about ballistics as I am. And lately, there have been some questions about recoil. Well, this morning I ran across an extremely handy webpage with some great calculation tools on it!! Check it out -- stuff for rifles AND shotguns...enjoy!!
http://www.zvis.com/bvjtools.shtml
Hueco
http://www.zvis.com/bvjtools.shtml
Hueco