Because it is fun! What if you can get another 1/16" of accuracy out of that rifle. Come on man!![QUOTE
I don't plan on changing anything unless something happens to the availability of any of the components or a barrel replacement on one of the rifles. I don't plan on shooting any all copper or any other type of bullet either. Why change when my loads work and work well! I have been shooting Sierra and Nosler Partition bullets for almost 50 years and have never been disappointed.
Did I mention, because its fun?!
That's why I have other guns that I "play" with. I also have a .22 Hornet, .243 and a bunch of handguns I load for. My hunting rifles do exactly what I want them to do, so I don't change them.