Gun owners absolutely incorrectly write the names of cartridges. I see it all the time. Let's talk about .28 and .12 guage. Or 9 lugar. Really want to confuse people? Get into the old .38 and .32 cartridges in cheap old guns. And I see this in all kinds of places where you'd expect people to know better, like a shotgun-specific forum in reference to shotgun cartridges.
Some people shoot the wrong ammo in guns - a guy I know's friend was shooting 7x57 in a 7.65x53 rifle.
I'm not debating whether TSUSA is spamming reviews by bots because I'm not a customer (never had a reason to be, I used to live in RI and I live in NH now). But never underestimate the ignorance of others. Add on top of that how amazingly bad many people are at writing.