You don't need to season anything except the meat you gather with that rifle. That being said let's get on to your first shot.
OK I assume the rifle is new so you will have to remove the factory "cosmolene" that protects the bore as the gun sits waiting to be bought. I would either do a hot soapy water washing by removing the barrel and the nipple putting the breech in hot soapy water and pumping the water through it using a patch on a jag then use some alchohol on a patch and drying the bore real well. Another thing you can do is use a high quality bore solvent followed by the alchohol patch and dry patches.
If you shoot your rifle with the factory grease in it it will be a real pain to clean and wont be very accurate.
Lose the word "seasoning" and replace it with "breaking in" you didn't buy a frying pan