Today I was at the range today with my pair of zkk 602. I was trying out a load with Barnes TTSX 250gr for the 375. It shot about one inch group so I will be pleased with that. I have Norma Oryx 300gr on the way in the mail that I will use during my hunt for moose.
Regarding the 458 lott I was just have a bit of fun shooting the 500gr Hornady Interlock.