You will find your brass lasts much longer. Well, as long as you don't try to turn the K-Hornet into a 222 Rem. The flowing of brass is reduced if not eliminated and the extra couple hundred fps increase is nice. You will of course need new dies, but I believe they are available from each of the major manufacturers. I have a NEF Handi Rifle that I opened up to K-Hornet. It is a easy mod. Just run the reamer in and cut the new shoulder. Both versions headspace off of the rim.