HKS speed loaders for revolvers Bar mats for cleaning pistols (the nubs keep tiny parts from escaping) A staple gun for tacking targets up A coffee can for policing brass A roll of Necco Wafers for cheap and challenging "reactive" targets
Yeppers this is from somebody that deals with salt spray on an almost daily occurrence. It is a real time saver as far as maintenance goes.
Pin gauges. I spent decades hammering lead balls down bores and revolver throats and then trying to measure them accurately. I've probably paid a couple of hundred dollars for all the pin gauge sets of bought, and I would pay it again in an instant.
They used to get dumped from the box into coffee cans when they got home, but eventually after running out of empty coffee cans I opted for the large two and a half gallon plastic bucket. Much easier when taking to the metal scrap dealer.
I never really liked stainless firearms until they became a practical necessity after I moved to the SE. All the same, I never liked Cerakote or other coatings like that either until I saw their usefulness in my climate and with my brand of perspiration.
I go through a can of Folgers French Roast about every month and use the plastic container for brass, cast bullets, and tumbler media...
Get rid of the holder. Use a shell holder from your reloading press instead. I had the same problem and this solved it.
Does photoshop count? As far as gadgets go....? I have a love hate relationship with the electronic earmuffs. Love how they work. Hate that they make me sweat there and they get in the way of aide brimmed hate and long guns with out scope... haven't tried with scope yet. But when I've used them, they perform great with not much cost. The variety of reactive targets has made things easier to enjoy.
Uplula for years ... and now the 10/22 version. Yes, I know 10/22 mags are not hard to load. But in the cold when you've got to load a half-dozen mid-match or when you need to load a whole bunch of 10/22 mags, the little Uplula is sweet!
I'm probably going to look like a fool for this but Reloading Manuals. For the lonest time I just took to the forums or looking up the data online (which is always so inconvinent trying to click around for the info you need). A good old fashioned book is just so much easier to flip through and the info is all in there. Not to mention, usually they have a realistic true-to-size diagram of the cartridge on top, as well as a few paragraphs of history. These are SO useful and allowed me to plan and organize which powders i'm going to buy next and bullet types. The other thing is another reloading tool, it's the brass holding tray things that you put your charged cases in to keep them upright before you seat bullets on. These are useful because I can count 50 at a time and easily verify the powder charges are correct in all of them; not to mention they keep the cases upright.
Reticle leveler. There are a variety of tools for this, but I've used an early version of this one for a couple decades. https://www.brownells.com/gunsmith-tools-supplies/sight-scope-installation-tools/scope-reticle-levelers/segway-reticle-levelers-prod56125.aspx