I have one Hornady LnL powder measure with a discolored and distorted reservoir from powder being left in it. I bought the measure that way at a deep discount! It still works fine but the reservoir wobbles back and forth a bit. A little bit of Teflon tape stuffed into the gap tightened it up. All my other Hornady, Lee, and RCBS measures endure being left loaded without issue. My mec 20 ga press has had about 2" of IMR 700x in it for at least 5 years