The unwritten rule is, those of us that have don't speak much of such things.
Sometimes in private, rarely in public.
With Internet some new wrinkles have come up, such as if a situation were to occur again Internet postings might be used against one in a court of law, be it criminal, or civil, or both.
Concerns of folks reading public posts by family and friends and figuring out whom someone is, and a civil case being filed, or payback.
Yes there are sharings of those that have,and one would have to conduct a search.
I will also share software, not hardware was the key, and is still the key.
Firearms from simple .22 revolvers with standard pressure 40 gr lead round nose, to small handguns in 25ACP, to NAA .22 mini revolvers, to 32 cal revolvers, 32ACP semis, small and medium frame .38spls with standard pressure 148 gr wadcutters, and 158 gr LSWC, 1911 with ball ammo, BHP 9mm with ball and even more modern guns made of polymer and using JHPs have been used.
Single shot .22 rifles, Marlin 60s, and Nylon 66 in rimfire rifles.
Lever action .22 and centerfire such as 30-30
Single shot shotguns, Semis, O/U, SxS, Pump, and Target Grade Competition O/U in .410, 28, 20, 16, 12, 10 gauge and even 32 gauge have been used.
Including youth models
When folks that have been there and done that, gather, words often are not spoken if the topic should come up, or be hinted at. Eyes, set jaw, head nods speak volumes when looking at a firearm or if a person has scars from a fight, and injuries from knife, or gunshot.
While the armchair rangers, net-ninjas, and teem-seel-six, go on and on teh Intraw3bz, with gun brand, platforms, modifications, accessories, gun cleaning, ammuntion types and caliber wars...
While the guru needs students and students needing a guru carry on...
Real World survival always boils down to correct, basic fundamentals such as often shared in cliches and quotes:
Software, not hardware.
Mindset, Skillsets "then" Toolsets...in that order.
ADEE...
Be the firstest with the mostest...
Shot Placement...
It changes you.