Does anyone know how hygroscopic smokeless powder is?

I passed the idea of bunk beds for the kids by the wife so I could have a climate controlled reloading room. It fell like a lead balloon. You might have better luck, gravity seems to have less effect at your place, at least on your powder. Yes I know it's corny but I'm bored at work and have nothing productive to share.

ETA: I've got a shop fan and that makes it pretty tolerable. The only part I do inside is the powder weighing, and I do that inside when it's crazy hot outside like it is right now since the fan affects my beam scale, and being in that shop without a fan is a recipe for a heat stroke.

The article doesn’t really lay out time of exposure and levels but just points out humidity or moisture level in powder can change burn characteristics.
My room stays around 35-40% humidity

Amount of moisture content has to affect charge weight but I'm not sure at what rate it does. I know a few guys that "dry" their powder out but I can't say I've ever seen a need to try it.

I've heard read that the bulk density can change when the solvents evaporate, but I never really thought about the powder absorbing atmospheric moisture. It makes me wonder if my chronograph really WAS right on a few occasions I thought it was not.

Cheap vibratory cleaner loaded with crushed walnut shell and a chunk of jewelers rouge that started out 1 x 1 x 2".

Change the walnut shell when the performance deteriorates.
After a few thousand cases, the chunk of rouge is about 7/8 x 7/8 x 1-3/4" with rounded corners.

Nice shiney cases!

Meets my requirements for accuracy which is MOP (Minute Of Pig) YMMV!

Perhaps match shooters that load large batches of ammo should leave the bullets seated long & then seat them to the ideal depth just before the match. That should break any bond developed between neck & jacket. Makes sense to me?

Judd does this.

I'm using a Hornady ultrasonic and their brass cleaning concentrate. I use one capful to 2 quarts or so that the cleaner holds.
I recap and run for 20-30 minutes with heat. Seems to work well.

Have been using a Lyman vibratory tumbler with their corn cob media. Works real good by often need to polish overnight.
I've lately been adding a couple good squirts of New Car Finish auto wax. Cuts the cleaning time down to 2 hours.

Both methods are working well. In the media tumbler, I do not recap first to avoid media in the primer pockets.

Good luck - Kris

Friday night I decided I just had to have a tumbler and noticed the Hornady was on clearance at Midway. I read the reviews and purchased it. I think it will be perfect for what I do. After reading this thread I feel much better about my purchase.

I have never taken humidity into account either. I'm fortunate enough to have a dedicated reloading/gun room. That's what happens when the kids move out. Anyway, I keep all of my powders in a large drawer where they stay at a constant temperature. I think for the fun of it I'll start entering the humidity level in my reloading notes and keep track of any accuracy issues I may have. You just never know what you will learn on the THF.

I bought some of the RCBS case polish for my vibratory tumbler based on some of the reviews on this thread and it seems to work really well. When I opened the box I thought it was a package from a cartel, but it seems to be a good product and inexpensive.

I'm in the same boat. My reloading setup is in my house in a temperature controlled environment, but the humidity isn't controlled. I'm going to start keeping track of it to see if I notice any difference.

My bench is not temp controlled all the time. I load ammo 12 months a year, and have not seen humidity be a factor. I get to shoot, out to 800 yards 52 weeks a year. Cold metal welding, of long term loaded ammo has been a factor, though.

What is "long term", in your experience?

Were you expecting something?

Anything over a month.

Copy, thank you.

I thought I was ordering Coca Cola!

Will case necks dipped powdered graphite before filling it with powder work to help break the bullet to clean neck bond? Just a thought.

As opposed to introducing another variable. Think it would be easier to set them long. Then re seat them when it is time to shoot them

I've seen lubed bullets throw ES all to hell.

Seat long, bump them back right before you need them.