Thanks, Big Bunny. I went back just now and measured the target again. It was 1 1/4" center to center at the widest spread of the group. The group actually was just three large holes.
The bullets I used yesterday are the same ones that my friend uses; I bought them from him.
Maybe it was the temperature, maybe it was me. That's the fun of handloading, or the frustration, depending upon how the load shoots.