What is your price range? Looking for a complete package rifle scope rangefinder kestrel reloading equipment brass bullets? These big boys drink gas. Does weight matter?
Planning on hunting with it? If so check some states have weight restrictions. The .375 and .408’s are getting more popular it’s a lot easier to find components now. Good luck I’m sure you’ll be happy with your choice. Check out the enabler cartridges that applied ballistics has developed. Hornady is releasing a cup and core a-tip so you can actually shoot for a reasonable $