Oh boy you have a wild one to contend with - a 9 1/2 lb 500Jeffery!
Is that a sleeved section just in front of the action for a recoil lug on the barrel?
Got me intrigued, guess you'll know when you get it home.
The range report will be interesting, not much real reloading data for this calibre.
Will make a great DG rifle being a single stack job - no feeding issues!