Wisewood there are lots of things that can effect the accuracy of the rifle. You may very well just had a bad day. I sure had my share of them in my life. Also depending on when you sighted the rifle in, and the temperatures and humidity at that time, all of that could make a difference. Then we get into powder age, just that you're perhaps not as comfortable today because of the cold. I would not get too concerned at this point. Besides, it only takes one flier to open a 1.5 to a 3.

Just continue the way you have been, swab between shots, and may be the next trip out will be better then all the others so far.