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And PO never advertised increased velocity as a primary reason to improve a cartridge. He was more interested in controlling bolt thrust and cartridge length growth with his designs in a time when a lot of suspect (in terms of strength) liberated military rifle actions were being used for sporter conversions than he was with building "hot rod" cartridges. Others grabbed the "more velocity" mantra and ran with it much more than he ever did...
-BCB
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The way I took it was he knew that an increase in chamber pressure was inevidable but like you said efficientcy,case streaching and bolt thrust were I think more of a concern than simple velocity gain.... He just took a case and made it more efficient (improved)There are some cases that even though improved do not attain much improvement from his design so a carefull search would be advised before you change your chamber
