I agree with
@ORjeff and I'll admit I'm as guilty as the next guy at a match of saying "it's what the club allows for gun handling so there's nothing that can be done" but that's probably not good enough especially when something like sweeping is occurring. I know I should set a better example but peer pressure is a bitch sometimes and nobody wants to be 'that guy' at someone else's range.
But I also a believer EVERY gun is loaded, always, period. I case and uncase at the line every time because first off I just think it's safer and easier for me, but I've also never been part of a club that allowed anything else. So when I go to matches where people can carry guns to the back line, racks or their cars I'm always on alert. Every club I've been to around the country has different rules about gun handling from what I've seen and it's not something exclusive to F Class in any way. I will say benchrest as a whole seems to have a pretty great philosophy of bolts out where done firing, end of story. My understanding is that European (and maybe other countries) also have a unilateral bolts out policy even for F Class.
FWIW, I've seen cases either in person or by account in both F Class and PRS where a 'safe and flagged' gun magically fired a round for one reason or another. In one case someone was killed, in another it went into the air with an unknown trajectory.
I've also personally seen a gun on the line that had a flag in it where I was on the non-port side of the gun and someone on the port side called out that there was a round IN the chamber and after the shooter protested multiple times that there was a flag so that couldn't be the case, he proceeded to pull the flag, close the bolt and upon opening the bolt a loaded round popped out. SO yes, flags are good, but they are not foolproof. It's why I'm a huge fan of those 12" long ones I see more and more of. In this particular case I believe he had a very short one that was less of a chamber flag and more of a 'you can't close the bolt' flag which I'm not a fan of for this exact reason.
For V2 and local matches at my club, we mandate that every shooter gets a visual inspection from another shooter and insert chamber flags before a gun leaves the line. I think it's good policy and if people are offended by having to ask someone to look at their gun, they shouldn't be on the line.
At the end of the day I'm going to sound like my father, but gun safety is everyone's responsibility whether new or old and anything that makes someone uncomfortable should be addressed so that nobody worries for their safety.