Ive bought many long guns at local auctions at very good prices. Ive said before though that handguns around here reach asinine levels at auction. I saw a high point 9mm (or maybe 380) bid up to 150 dollars at an estate auction (plus a 7% buyer's premium and background fee) a few years back. There were gun stores less than a mile away in both directions selling them for 130. No extra mags.... nothing. The guy I was there with even bid it up to 120 with his brother and I telling him better. I got a marlin 39A in good condition at that same auction for 350. At another auction from that same company but years later I watched a plain beretta 92 go for 600 in pretty beat condition. The next gun was an engraved browning bl22 I bought for 300. Followed by a savage 12 guage that is a strange side bolt action that looks exactly like a semi automatic. I started that one off when it got down to 75 bucks thinking it was a semi auto....I accidentally bought it for 75 bucks. Lol.... You win some you lose some.
I always make a list of which guns I'm planning on biding on and my max bid. Ive seen my friends get in biding wars and triple what they said was the max though. I won't say I haven't went over a couple times but i do pretty good. It's a good idea to have a list. Also every auction I've been to has the guns on display before the auction to fondle. Look closely at anything. Especially anything rare. I saw an old military bolt action (I can't remember maybe springfield) that was being sold as the apparently rare sniper or marksman version that was clearly the product of ebay aluminum flash hider and other cheap parts. I knew nothing of that model and had no interest in it but knew it was BS. I heard other, more knowledgeable in that rifle, guys saying the same thing later.
I've Probably bought 75 or so old shotguns and rifles for good prices but I don't recall ever winning a handgun I actually went for. I have won a few "junk" 22s and buckmarks/mk2, 3, etc that were just good deals but never one I actually went to buy that I can think of right off.
Typically the guns with a following (the trailside and Hi standards on your list, a python, cooper, colt woodsman etc), will have guys who drove to the auction to win that gun. They rarely go for a good price and often go way over what anyone would pay for the same gun in a store. Pride bidding i think. The plain, run of the mill guns in my experience are the best bargains. No one drives to the auction to buy a mossberg 500 or Marlin/Glenfield/westernfield model 60 or similar. I've started bids off at exceptionally low prices just to get things rolling and won more than once.
I've also went with a list of guns to bid on and came home with a bucket of chains, a snowsled and a new old truck. Lol. Be prepared