A number of years ago when I was making reproduction interior doors, our supply of clear Eastern White Pine temporarily dried up. Our supplier told us this would work the same in our application of raised panels for the doors. The lumber was all planed 13/16 and straight line ripped, 10-12" wide and clear. Some of these boards only 4-6 growth rings. In the course of making several batches of doors, we encountered lots of twist in the panels after they were milled. Some of those that were flat enough to put into doors eventually cracked or twisted. We tried to save the rest of the panels by stickering them and clamping or weighting, but most developed cracks. We also ordered some narrower stock for trim. This milled up fine with a simple bead on the edge. These stayed straight until they were cut and then they would twist overnight with some cracking and checking on the cut ends. Moisture content was fine. My one and only experience with this stuff, never again. Also, the color was a little off from native pine.
You will find that Radiata is used in a lot of millwork products today, and the quality is hit or miss.