Mr Dudley:
There is an entire thread " Fired Length of Commercial Shotshells" which some have found informative. Austin Hogan also provided a Parker chamber length chart and SAAMI specs. That thread and Mr Hogan's tables thoroughly covered the matter you ask.
You may be familiar with the Parker practice of chamber lengths and the concept of pressure sealing , if not, ask.
You may also be familiar with the Sherman Bell analysis of minimal short chamber length. If not, ask. I am not suggesting that even applies in the situation at hand, just that a person of serious interest in the matter might want to be aware of his findings.
FYI, here is a sample photo from that thread. Although RST shells are fine, a Parker shooter , with original chamber lengths in either fluid steel or damascus steel barrels, is by no means limited to using RST shells, although the RST owners are fine fellows.
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