Good reason to ALWAYS carry a few slug loads with you. If you've got the gun with you, having 2 or 3 more shells on your person wouldn't be asking too much. If you need to defend yourself from hostile animals or man you won't have time to run to the truck and rearm yourself.
I always carry a pistol on me any time I am at my Range, and especially when I go down range to check targets. I never leave my Primary Weapon laying on the bench with ammo sitting right next to it, and if there are people I don't know there, I take my rifle with me when I check targets.
My range is located pretty far away from civilization, deep in the Los Padres Nation Forrest 13 miles north of Ojai. There is no Cell service so if something goes wrong you're on your own until somebody else shows up. During the week that could be a while. Point being you never know when or if somebody is going to "go off," even if they appear to be friendly. If you know the others there, then maybe no problem but if you don't know them,,, Discretion is the better part of Valor. Better to be safe than sorry and all that.
On a slightly different note: We just had 4 DOJ Agents here in CA go to a guys house and confiscate some weapons he had tried to register. They decided they were illegal and came in and confiscated them. This guy was absolutely no threat and that is why they chose him. Had they gone into a barrio in Oakland, LA or Fresno they most likely would have been killed, and they knew it. So they picked this soft target to make sure word got around that they were confiscating guns.
Nobody is registering guns in CA any more, like all Liberals they screw up everything they touch and by doing this they insured that nobody will try to register anything ever again. It is obvious that it is pointless to try to obey unconstitutional laws. They don't care so why should you.
Here's the video. https://www.youtube.com/watch?v=n6Lyeeq17fY&t=776s
My .02
Randy