Uploading magazines, single stack and double stack
I use to upload all of my guns until a bad experience occurred to me with several of my gun safe firearms. I mostly buy used firearms and my Sig 229 in .357 sat in a gun safe loaded with 12+1. I bought the gun used and replaced all of the magazine springs with Wolff gun springs, did a range test, and then when the gun passed the range report, I loaded it up and put it away in the safe for 9 months. Thinking that taking this gun to an IDPA match would be a good way of testing it out and making sure it was reliable, I just took it with me and give it a run.
I had another Sig 229 with me, but this was in 40 S&W and it was also loaded to capacity. Needless to say, both guns failed on me. I have a Colt 1911 with 8+1 rounds of 45acp in a Wilson Combat magazine and it has never failed me. The only problem I have with it is that I need to really make sure the magazine is seat properly because it barely clicks in. All magazines have been downloaded by at least 1 rd and since then, all of the guns have passed range tests even after long term storage. Be careful about what you read on the internet, uploading many guns for long periods of time will decrease reliability.