How many time can you reload the same case? 9mm, .223, whatever. Just wondering because i was priming some 9mm and noticed the year stamp was 98. Just got to thinking, "If this brass was manufactured in 1998, how many times must it have been reloaded?"

IMO if it is in spec, primer pockets hold the primer, and there are no cracks they are gtg.  I reload 223 and 308.  With that said I have yet to go above using the same case 5 times.  It may depend on hard you run your loads too.

I reload mostly for plinking at the range. Hopefully soon looking into shooting competitively. But my loads are minimal. Been using CFE at only 4.8gr. I've gone hotter but found that its an easier load to handle.

Straight wall pistol cases can be reloaded many many time. Especially when light loads are used.  I have .45 acp cases loaded well over 20X.  I usually lose them before they wear out.  If anything, I look for cracked necks on pistol cases. 

Rifle, bottle neck cases, if you use good quality brass maybe 5X reloaded in a spacious factory chamber and no annealing.  Without annealing the necks, they tend to crack fairly quickly, due to the sizing and firing work hardening the brass.

If one has a tight match chamber, neck annealing, minimal sizing, and good brass like Lapua, you can reload them many many times as well.  I have .308 brass I have reloaded maybe 15X and no sign of failure noted. I also had a 6mmBR brass that I loaded over 20X before necks started failing.

Just make sure to inspect brass, and dump any that are questionable.

Hope that helps. Stay safe and happy reloading!

Lubricating the cases will prolong the life of your brass.
In my 45 acp, I usually get unreliable function after about a dozen reloads.
The rims get all beat up.

Thanks for the input guys. I inspect each case. They look solid. Don't think any of my brass is anywhere near 10x let alone 20x. Nothing to worry about then. Shoots guys...

So this is along the lines of the original post. I have been considering starting to reload and doing some research for a few months. I have a few hundred twice fired Lake City brass and a hundred once fired Winchester and Federal brass. Would it be a good idea to use these cases as I'm learning to reload or should I start with new brass?---- I shoot .223 out of a bolt gun so the brass is never bouncing off the ground on ejection and getting bent out of shape.

So this is along the lines of the original post. I have been considering starting to reload and doing some research for a few months. I have a few hundred twice fired Lake City brass and a hundred once fired Winchester and Federal brass. Would it be a good idea to use these cases as I'm learning to reload or should I start with new brass?---- I shoot .223 out of a bolt gun so the brass is never bouncing off the ground on ejection and getting bent out of shape.

I have shot quite a bit new 223 ammo and my reloads. I found even the new brass can crack a case neck on the first shot. It's not common but I have had it happen to me. I started reloading 223 using my once fired Federal and Lake City brass. There really is not much of a difference between loading new brass for the first time and reloading once or twice fired cases. The biggest thing I can recommend is case preparation. Make sure all your cases are the right length otherwise you need to trim them. On the brass with the crimped primers you need to remove that crimp. Either by swaging or with a rotary tool. I prefer the rotary tool route. Make sure your brass is clean and dry. Does not need to be shiny. I prefer to full length size my 223 cases but at a minimum you will need to neck size them. Also, I like to clean the primer pockets though I have stopped cleaning them as well as I used to. I found some of the most respected experts on reloading never clean their primer pockets. So I take a more centrist position and clean the real dirty ones and leave the ones that are not bad. Also, I inspect my reloaded brass primers before I pop them out looking for signs of high pressure. I also look for cracked necks and headspace issues. After sizing I reinspect for cracked necks. I never get cheap and try to use questionable brass just once more. I have a friend who does that and got sprayed in the face when a case failed. Lucky he was wearing PPE.

Re. 223 reloading

Mr. Inspector pretty much said it all.
The only thing I could say is that if you are only shooting a bolt gun, then use a neck sizer only.
Also i noticed after about 5 loadings my cases developed loose primer pockets.
Sometimes the primers would pop out.