FWIW, I agree with you. I can't stand stuff moving, or not being where I left it. I deal with it a couple of ways:
1. I have so much crap on my belt that it has nowhere to go. If that doesn't work for you, stack your gear with keeps against stuff that is fixed in place. See #2.
2. Some stuff is locked in place, via attachments like a Tek-Lok or similar. You can use that as an anchor point to push gear up against it.
3. Run more keeps than you need. If I had a piece of gear that i wanted to stay put and had nothing to anchor it against, I'd put a keeper on each side. You can also run keepers as a placeholder/spacer (though if they have brass or nickel bosses it may look silly, use plain black instead.
4. Accept that some stuff is happier an inch or so off from where you want it, and plan on putting it there instead. Gear will migrate to positions where it doesn't move as you go about your day. If you can figure out where that point is, just start out with it there and secure it with keepers.
Some of it will be a matter of figuring out what you would prefer to stay put and what you MUST keep put. Your gun and reloads fits the latter category, naturally. You may end up springing for your own gear if you want it done right. In some cases, I have done that, despite the fact that I am issued gear as well.
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