using 22-250 cases for 6.5 creedmoor?????

So what is the experience that anyone may have with this? I have some hornady brass, but it stretched quickly. I have tons of 22-250 brass that I can neck up and fireform. any downsides to this?? I just wonder if it works with the winchester brass I have, I might just buy some lapua and have great brass for the creedmoor??