Being that you are going hunting on monday and will only be taking one shot to 50 yards it is certainly not necessary to break in the barrel before you go. When you go to sight it in just clean it after every three shot group and you will be fine.

If you want to go through the entire process when you get back then go for it but I would not worry about before Monday.

Actually I, nor my father, nor my grandfather have never "broken in" any of our barrels and they all shoot just fine.