Just got some 223 brass from Midway. They where out for quite awhile and it is available.
They had Remington and are out of some stock already. Still have Winchester. I have used nothing but Winchester for 223. No reason just never bought anything else.
I was wondering if there is a preference for Remington over Winchester and why.

I have shot a lot of different .223 brass. Never any problems. I even shoot old military bullets and reload the brass, never any problems. As long as you size it right , it should work.... But I shoot a bolt action, don't know about autos....

Some rifle brass, depending on make has thicker walls, lowering the volume and increasing pressure for the same load.

I have Remington, Winchester and Lake City all in the rotation and I don't notice too much difference with the .223. There is a lot of variation in other calibers though, I think 30-06 is one of them.

I don't care for Remington rifle brass these days. I've experienced excessive spring-back in the necks in the last couple years in their stuff. Can't say I've tried their .223, though. The .223 brass I have is a combination of NATO, PMC (which appears to be mil-spec), and maybe a bit of Winchester. Newer Win brass is definitely higher-capacity brass than everyone else's. I haven't experienced anything negative arising from that higher capacity, though.

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I prefer Remington and Starline brass, I did buy 1000 pieces of Lake City brass for my ARs/Mini14 and I'm pleased with it.

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I use Remington in my 30-06 with no issues. I use range pick up brass for my AR, Federal, Lake City, PMC, Winchester, some Rem, and others. Never had an issue, I use a fairly light load for plinking so I load all brass the same, I do have some Winchester set aside for a varmint load with higher velocities.

I do not use mil-spec brass. My .223 is a M700 Classic boltgun. I have both Remington and Winchester. I can't see any difference in performance. I keep the brass separated by brand and # of times loaded. It's all good.

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All I use is once fired Mil brass in my AR, M14-M1A, and M-1 Garand.

I've got a grocery bags of it.

Swedging the primer pockets is the worst part of processing it.

Steven

The swaging can be the worst part of using any brass with crimped primers, but fortunately it is only a one time operation per case. I use a RCBS swaging kit and it works pretty well.

I checked the case volume of a number of military and commercial 5.56/223 cases. Wasnt much difference. The exception was Norma brass. Was quite a bit thicker. Had 100 rds but threw them away. When they became mixed with the other cases, they would overflow with powder, even with a light load.