Training Hammer

Let's say I wanted to have a shorter hammer to crank on indoors over the winter that wouldn't be thrown, just turns to mimic the throw in a limited space.  Can one of you math wizards tell me if I had a 25" hammer handle, how heavy would the weight need to be to have the same "feel" of a 16lb hammer at 50"?  I have been taking a 28lb weight and turning with it, but I want to put a handle on something that mimics the hammer grip (but I'm going to put a "bulb" on the end so it won't slip out.....although that could be pretty funny as long as no one were killed or maimed).  What's the ratio?  would it be a 1:1 ratio (i.e. the same ratio to lenght for a 25" to 35" to 45") or is it curved?  Thanks  (p.s. I'm a social science major......with a Chemistry minor so that means I used to know some math, but mostly forgot all of it except the statistical stuff.

I do not know if this would help. I know the olympic hammer for a 16 pound ball takes 607.5 lbs of pulling force for a 264 foot throw.

Try this site  http://www.onlineconversion.com/