Any reloaders find their brass does not polish well in cold weather?

i use electrosonic. i don't have that problem. i always use to use polish in my media never had a problem then either.

I live in Alaska - I have set my tumbler on the front porch at -45F and had the cases come out fine.

Sounds like your media is old and worn out, or, you could have debris like sand or dirt mixed in - or too many cases. Dump your media into a screen and let all the small particles fall out. The put some in the palm of your hand and push them around really hard. If the media doesnt hurt - it's all rounded like little balls - it could be old. And if you get all this nasty black stuff - it could be dirty.

Dont bother cleaning and washing your media unless the stores are out and you have no choice.. Most of the green or red rouge - the the crap that comes off the brass - the stuff floats and makes a huge mess.

My polisher is in the basement where it is around 60 degrees. The polisher is filled with a mixture of walnut shells and corn cob and my brass comes out looking just fine.

For gungey BP brass, an overnight soak in water and Lemi-Shine gets them clean with a matte finish. or CAS competition or for general range use I just let them dry and load up. If memory serves, I believe the Lemi-Shine idea was Cane Toad's.

Temperature shouldnt affect it

Try changing the media and adding some new polish

IMO, if the carbon is gone, the 'shininess' doesn't matter at all.

But I use an ultrasonic cleaner, and in an temperature controlled environment, so I've never had that problem.

I run rice inside the house in a controlled temperature environment.