You can compare every load in existence and write down which one is faster and flatter shooting.
try
www.federalcartridge.com
www.winchester.com
www.remington.com
Then you can make an informed decision. I don't know which is faster or flatter shooting. I only have experience with the .338 Winchester, which has been around forever and kills elk just fine, but nobody wants to hear about it, so I will stop talking about it LMAO.