Re: Retumbo in cold weather? My rifles suddenly started shooting Low.
Did you use a mirage shade when you originally did the load work ups in the warmer temps. If not, you could easily see what you are getting in both guns with different scopes. This happened to me and I started shooting 12" low at my zero. Once I started using a mirage shade, the problems ceased to be evident. Also, pilot error could be one of the causes.