Did that several times, literally walked in and left the ammo behind with the other stuff and didn't realize it till I got back out. Made the rifle lighter though! I have also been known to carry just 1 in the chamber, and maybe one in the mag to shave weight, but have needed just one more a few times doing so.I recommend everybody do this once or twice.
Go on a short hunt. Take your weapon and your stand. Nothing else. Nope, not even that! Leave it all.
Write down the things you miss. My pack is virtually empty.