I recently seen a Copper at Lowes, was not that impressed. Just IMO. If you have a classic car with an orange peel paint job, I am sure it would be rejected.
I agree with Troy, I have a OT Black top and when I hold the Yellow, to me, it feels like a noticeable weight difference. Grill being early 70's.
There is a thread way back where, Reilly did some weigh tests. There was slight difference, if I remember correctly. But again, I am old...
Buckie, Pantone(R) 876. Be careful it is a registered trade mark. Just Fun'n ya.