I'm working with two different bullets in 7-08 right now. It'll progress to 3-4.
I have five different boxes of bullets for a new 223 I purchased. Plan on loading them all this winter and shooting them next spring.
I think it's an even better idea based on the fact that we never know when we might not be able to get one bullet, but can get another. Get your data/notes down beforehand. That way you don't have to do any surprise, last minute testing.
