Now I’m sure that, with the shortage of reloading components right now, the recipients of these emails are all working 24/7 to catch up on the backlog so I wasn’t surprised that several couldn’t take the time to answer.
But three did, two of whom I will classify in the “expert” category. Here’s what they said.
Probably half of my brass is Starline and a good portion of what’s left is Remington. As manufacturers, they make top-quality products. I think that makes them experts. And from what I’ve seen and read, Crossfire seems to be right up there, too: They all say it’s OK.
So from now on, when the weather is not conducive to drying outdoors, I’ll turn the oven on to 200 degrees, cover a cookie sheet with aluminum foil and pour on the brass.
Baked brass, anyone?
I’ve switched from dry vibratory cleaning (that needed a rinse afterwards to remove dust) to wet tumbling with stainless steel media (complete package from StainlessTumblingMedia.com). As the experts above report and I can confirm from my own experience with well-used and many-times-reloaded 45 ACP brass, there are no detrimental effects from the oven treatment at these low temperatures.
Here’s a useful quote - “Changes start to occur in brass grain structure at 480 degrees fahrenheit. To properly anneal brass, the temperature needs to be at 650 degrees F. for several minutes-BUT this will transfer too-much heat to the lower case in that time. So we need more heat for a shorter time. We need to raise the neck temp to about 750 degrees F. only for a few seconds to anneal.” See http://www.annealingmachines.com/how-to-anneal.html This would seem to indicate that 250 fahrenheit would be a safe temperature for drying. It’s above the boiling point so the drying should be quick, but more than 200 degrees below the point at which “changes start to occur in brass grain structure”.