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There is an 8x60RS. Is this an otherwise identical but rimmed case? I note the CIP maximums for the 8x60RS are 49,000psi(CIP Pezio), 44,000CIP, as these are lower than the 8x57S by a considerable amount, enough to make the 8x57S a more powerful round - in Europe - at 57,00PSI(CIP) and 49,000CIP. (35,000PSI SAAMI).

Surely that is lower than the 8x60S.

The pressure list I observed did not have the rimless 8x60 round.

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The German 2000 proof tables (same as CIP) give these maximum transducer pressures, Pmax in bar:
8x57I (.318" rimless) = 3800 bar
8x57IR (.318" rimmed) = 3200 bar
8x60 (.318 rimless) = 4050 bar
8x60R (.318 rimmed) = 3400 bar

8x7IS (.323" rimless) = 3900 bar
8x57IRS (.323" rimmed) = 3300 bar (same as .318WR and .333 Jeffery)
8x60S (.323 rimless = 4050 bar (same as .30-06)
8x60RS (.323" rimmed) = 3400 bar

As you see, the rimmed/flanged versions intended for break-open rifles always have lower max pressures than the rimless ones. As the 8x60 cartridges allow slightly higher pressures than the 8x57 ones, they are more powerfull, but IMHO it takes a very sophisticated hunter or animal to note the difference.

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