"Prime the weapon until ready to fire" could also mean when your ready to hunt. Face it, you step out of the vehicle and get loaded up, how many times have you jumped one going into a stand or walking a ridge to a area you're going to work. So you are ready to fire. You just have not cocked the rifle, or pulled the trigger. Alrhough keeping your safety on until moments before you actually pull the trigger is just common sense.

Besides that, walking around without the primer in place or a cap on a nipple, what ever, leaves that area open to elements. If you were using a powder that liked to suck moisture from the air (such as APP or Pinnacle so some claim), simply not having that area sealed in any manner could contaminate the powder charge somewhat, and effect the accuracy of the load.

No, I alway have the rifle capped and ready to shoot. Good luck with your Omega. A great safe rifle there.