Greetings,
I found a picture of the Ross bolt face and it would probably be classed as a controlled round feed. Worshiping rifles with controlled round feed is pretty much a US thing due to their experience with the Springfield, Enfield and Pre 64 Winchester Model 70. The feature was developed by Mauser to stop jams caused by raw soldiers short stroking the bolt. Some think it is the best thing since sliced bread but it does have some problems. The most recent one of these is difficulty of feeding the short fat cartridges or those the action was not designed for. The US made actions mentioned often had a coned breech and poor gas handling meaning the action was not as safe as others if a case ruptured. This was more common in earlier times. None of this applies to the Mauser actions.
Regards Grandpamac.
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