Thread: Has anyone had this problem?

I worked up a load with AR 2217 powder and ELDX 162 gr bullets, I was using 171.5 gr of powder and it had a velocity of 2940 with nice groups some even tack drivers. I ran low on powder so got some more yesterday, I replicated the load and headed back to the range and to my surprise they were traveling at 3050 fps instead of the 2940 that I was getting the last time I went out and the groupings were terrible.
I went home and broke the remaining loads down to double check I had put 171.5 gr's of powder which I had so now I am wondering if someone has slapped the wrong label on the new batch of powder as I have no other explanation for it.
The only thing I can think of doing now is lighten off the load with the new powder to reduce it back to around 2940 fps and hope it comes back into tune. And I had 2 cony graphs going and they were both reading the same so it isn't a faulty machine.
Thoughts please?