I've tried several different methods but I almost always shoot in 65F or higher. At 30F, I'm guessing it matters a lot less.
Usually I do something similar to what Jim suggests but I stop at 3 shots and give the barrel at least 5 minutes to cool down or 10 if it's still warm at 5.
Also, keep in mind that the accuracy and pressure indication results you get at 30F may not apply at 60-70-80F...
Still happily answering to the call-sign Peetza.
The problem, as you so eloquently put it, is choice.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.