Bloomer

Whole rifle was well clean and I feel I’m a very comfortable shooter. Going on 5 years as an 11B with the ARMY and 20 years of an avid hunter.

Just got a DPMS panther arms. Went out to confirm my zero at 100m. Couldn’t land paper but after a few more shots and no adjustments my rounds started landing right on top of each other where I was aiming. Is this because my barrel was cold? I can’t really get my rifle warmed up if I’m hunting with it.