I found a Lovex 2011 Reloading Guide and reproduce a couple of their pages which cover the various 8x57 cartridges.
I acknowledge their copyright. PLEASE NOTE THIS INFORMATION IS PROVIDED WITH FULL DISCLAIMER AS TO LIABILITY FOR ITS USE. YOU USE IT AT YOUR OWN RISK.
Please note that the CIP pressures for the Rimmed (IR and IRS) cartridges are significantly lower than for the Rimless (IS) cartridge.
It would be unwise to use in the Rimmed cartridges loads developed for the rimless cartridge in bolt action rifles.