Should be a mini chassis. I don’t remember what manners suggests, but with any chassis or mini chassis I:
Put action in and start threads
Stand the rifle up vertically with butt in ground or table. This lets gravity seat the recoil lug
Torque front to 25 in
Torque back to 25 in
Torque front to 65 in
Torque back to 65 in
I have also stepped it up 25, 45, 65. But didn’t notice much difference.