Ness Orange Pekoe is really pretty, but it might be more of a peach color than coral. But just noticed you're looking for Macs... Mac's Strawberry Sundae is probably the closest to coral colored that I've seen.

In my experience with Macs, the colors are not always consistent. However, they have a clear, very attractive coloration. The colors of one have center Rays ranging from coral to tangerine. The outer edges are a bright warm pinkish coral. It is a standard. Suggest you try a few. I have read that orange pekoe is not stable in colors. It is difficult to find a true coral that is consistent. The colors vary with the light and temp and probably age of the plant. Let us know what you learn as you grow out a mac's as others are interested in the topic. At one time, I grew some Lyons chimeras to get the coral look. Lyons also has several standards with strawberry in the name that are close to coral. Also, midnight sun is a small, compact standard that blooms coral-red. It grows symmetrically. So do the macs I've had