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The 577 3 1/4" is a rare cartridge from what I can gather.

Expecially around that time when Jeffrey were doing the 600NE
- OR at least developing it.

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According to Hoyms book, the 3 1/4" .577BPE was listed up around to 1925 with 560-650 grain bullets, offered by Westley Richards.
Charged with 65-75 grain cordite or 160-167 grain black

I know one day a prime speciem of a .577BPE doublerifle is to found in my gunsafe