I do have a few 180 gr partitions that I bought for $13/box of 50 from SPS. They didn't kill any better or faster than what I have always used.Better bulelt? Probably. Required? No.
Those were the good days. I have some 200gr partitions from about 5 years ago, that only cost me $13.50/bag. I should have bought a truck load at that price, but did not realize they were going to be pricing how they are now. For elk, the 200gr in the 30-06 is the real winner. You can definitely get by with the 180 though. However, the OP doesn't want to buy Noslers.
I was at a damn shop in Reno a few days ago, and there was an old open box of .308 180gr Nosler partitions. The old ones that were turned on a lathe. I asked how much they wanted for them, and the guy comes back, and says "these were the first Nosler partitions, they want $100.00 for this box". I told him they can keep them for that price!!! This was at Mark Fore and Strike. I don't do much business with them, as their prices are generally way too high on stuff. Then, the manager comes back, and asks if I wanted the bullets, as they were the first partitions. He said, "did you know that?". I said yes, I have some at home, but I for damn sure did not pay $100.00 per box for them!!!! He looked dumbfounded.