tho,
The reason the Lost Rivers are so much coin is because they are a solid copper bullet that is turned on a lathe to a fine tip that will almost draw blood if you push on it hard enough. They are also a totally different alloy of copper than the Nosler J4's. Barrel makers say that you have to have a barrel made to shoot the LRB's and I'm not talking about the throating of the barrel. I'm talking about the riflings themself and what angle and leade they are made.
Yes, they have ultra high bc's, but if you have your barrel made to shoot them, and your gun doesn't really like them, then you're screwed! That is why you don't see anybody on the 1000 yard firing line shooting them. Buy a j4 (Nolser j4, Berger, Cart', or JLK) or Sierra and don't look back. As for your other question, A quality bullet will pay off every inch it travels over a cheap bullet. Buy well once!