want to get it red hot. The easy way is to hold the case by the back (near the web) with your fingers. Place the neck into the propane torch flame and rotate. When the case gets too hot to hold, open your fingers and let it drop into the 10 quart bucket of water you have placed right under the torch flame. The neck and shoulder of the case will usually be discolored.
According to Ken Howell, that just doesnt cut it. It won't reach its 675F? Also, different cases different temps. I know John Barshness claims this method. But what I find with 300RUM cases it won't even melt the 475F temp paint 1/4" below the shoulders.