I had that problem with my rifle. Since I had the rifle only a few weeks before calling K-T, they sent me a call tag for shipping and I returned it under warranty. After getting it back, I was able to sight it in with only a small leftward adjustment.
Give them a call. Be sure to ask about the call tag. You will find their customer service second to none!
Give them a call. Be sure to ask about the call tag. You will find their customer service second to none!