Keep in mind the LoneWolf barrel will be short chambered to fit your exact load you that you make. It most likely will have to be finished reamed. Dillon dies are fine, you should give them a call and tell them what you are up to, very helpful guys. Dillon is also a member on Benos. Barrel length has nothing to do with spring weight, that's just for the slide mass. You may find it beating up the frame a little with 17 lbs, but there are higher weights available. What dot are you going to use?
http://www.brianenos.com/forums/index.php?showforum=78
http://www.brianenos.com/forums/index.php?showforum=78