The 270 action will work just fine for the 6.5 Creed. I just did the same thing you are doing, but I did mine in 260 Remington Match. I also went with a Criterion @ 25".

I will say though.... Take a look at a replacement stock like a Boyds Pro Varmint Laminate at the minimum (as you are going to be competing) and probably should look at a McMillan stock if you're serious about competing. It will be a much better and more accurate stock for your rifle. The plastic stuff just doesn't perform and after opening the barrel channel, it will become even more flexible (not what you want). That's what I did anyway (Pro Varmint)... It will shoot .5 MOA if you do your part on the trigger after that.