All of these groups are plenty good enough for any big gamehunting application. In fact, some are good enough for serious varmint shooting. Looks like your new 7MM-08 is a keeper. I wouldn't get too focused on the velocity - deer will never know a 2706 load from 2798 fps load.

In addition to trying these loads in cold weather, you might also track how well the gun holds zero over a variety of temperature and humidity conditions. Some of these dime size groups could wind up being baseball size groups, in terms of where the first shot from a cold barrel might print on a given day.