Why yes, I do find this of interest.
I have noticed in many of the posts here that everyone seems to a agree that the Remington 158 grain SWCHP load is made of a softer alloy and expands more readily than the Federal or Winchester loads. So the Nyclad load not expanding at all I would have attributed to it being made of a harder lead alloy, but you said that you have gotten good results with the non-Nyclad Federal load. I would not think that the plastic coating would inhibit expansion, especially with the Nyclad load having a slightly higher velocity than the Remington load you tested. I guess you never know until you try it out.