Originally Posted by Hairtrigger
Get a cooler large enough for the rifle too
Now that's funny. Brings back memories. My younger brother used to test out new shotguns for his duck hunts by loading them up spritzing with water and then sticking them in our old chest freezer until it was good and frozen. Middle of the summer and you'd see him standing by the freezer with gloves on garage doors open with path clear to grab the shotgun out of the freezer and dash outside to see if it cycled when cold.
I think he started this the summer after he thought trying to dunk a basketball on our outdoor court while covered in ice was a great idea. His head bounced every bit as good as the ball. Nothing like seeing the whole family laughing in the ER with him asking, "Did I make the dunk?".
Ok well, as one of the comments mentioned you aren't going to see everything that happens to your rifle when it is cold but you can test one variable which is better than nothing. Best case it won't hurt a thing and you might just learn a little something about your loads.