I started with R-P brass in 1976 and only once had an initial box of 20 with some shorter than the rest which were immediately replaced by Remington. Since then I have used Federal and Winchester as well in rifles, and as long as I resize the shoulder back 0.002" after firing in the same rifle they were used, the life is extended until the neck cracks. At times the primer goes in more easily than expected, but I remove those primers and toss the cases. I've not noticed any differences in accuracy that can't be clouded by seasonal temp, barometric pressure, heat or cold of the day, or just me having a bad day.
When I started, it wasn't unusual for the case to fracture at the head, but only in my Remington Model 700 that had a chamber so long I could not seat a 100 grain .270 HP to 0.015 or 0.02 without it falling out of the case.
In handguns, .44 Mag R-P cases that I've had since 1976 are still being used today. In 9mm, I've had so many different cases I can't even list them here by memory. I did have some Winchester .45 ACP cases that had unusually large primer pocket holes but I just ditched them. But I've not yet had any problems with 9mm, .380 Auto, .45 ACP, .45 Colt, .454 Casull, .44 Mag, .38 special, and .357 Mag that I can trace to the cases.
When I started, it wasn't unusual for the case to fracture at the head, but only in my Remington Model 700 that had a chamber so long I could not seat a 100 grain .270 HP to 0.015 or 0.02 without it falling out of the case.
In handguns, .44 Mag R-P cases that I've had since 1976 are still being used today. In 9mm, I've had so many different cases I can't even list them here by memory. I did have some Winchester .45 ACP cases that had unusually large primer pocket holes but I just ditched them. But I've not yet had any problems with 9mm, .380 Auto, .45 ACP, .45 Colt, .454 Casull, .44 Mag, .38 special, and .357 Mag that I can trace to the cases.