500
I also have a Jeffrey 450/400 but thankfully it is shooting fine so that does not add to the confusion.

I am currently preparing for an elephant safari to Tanzania in 6 weeks so am limited in the time to experiment with the 470.

I do want to try some different seating depths for it but I will probably stay with a light crimp for the time being because I would not have enough time to become confident of the neck sizing required to go without crimping.

I appreciate your information.