Carry 3 guns several miles and get back to us. Carry your supporting equipment and ammunition load out you plan to haul.
A long arm and a side arm are common and easy to do. I do it weekly. Carrying 3 is a PITA and heavy. Last year on a back country hike, a friend injured his leg. So on top of carrying my gear, I had to sling his Benelli M4 and light pack. So I had my pack, his pack, my LMT MRP, his M4 and my other gear on my belt.
That was a long hike back.
The 12 gauge is difficult to justify due to the weight of the ammunition. I know everyone here is SOG and can hump their weight in gear across any terrain for days at a time without detection.