I reached out Lyman and after some screenshots and back and forth, here is their response:

Hello,

I have checked with the techs and here is the information received.

We are listed at a higher charge weight than other published data however we have thoroughly tested these loads in house and have been printing that data for several years with no negative feedback.

Its safe data as long as the firearm is in good working order and not an antique or something along those lines.

Thank you


Customer Service Team
Lyman Products