Another easy way to find Remington bullet B.C. data is in their catalog.
They list the B.C. in the last column on the pages where they give all the velocity, energy, and drop data for their factory loadings. Quite interesting to see the differences in some of their offerings for the same caliber.
That Remington 257 100 gr PSPCL is a tough little bullet. I have shot hundreds of them out of my 257 Roberts with great accuracy.
They fared well with the water jugs, retaining their cores at 257 Bob velocities.
I have used the remington core-lokt bullets out of my 270 win and they are a hard bullet to beat. They were pretty accurate. But as soon and I switched to 140 grain hornady btsp I couldn't switch back.