Rimmed case concern

[Doco overboard]

Pictured are two rimmed cases. A 30/40 Krag and a .303. Both are new once fired cases and the Krag a Remington case and the .303 a PPU. Both have what looks to me like the beginning of a case failure. Or could this be a reflection of a dirty scratched or worn chamber between the two arms. Both rifles do not exhibit the same signs on every ejected round. The once fired 303.cases seem to have a more crazed appearance. Would some one advise for safety. Both rifles are clean and have given good service in the past. I do not own any head-space gauges for either caliber.
Thanks

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