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I have been trying to do some research on a few top British maker .577 NE double rifles that were built around 1903 and the barrel flats are stamped:
.577 EX
90 Cordite - 650 Max
These are .577 NE 3 inch guns and I take they are regulated/proofed for the 90 gr Cordite / 650 gr Bullet load. How does this load compare to the full bore 750 gr loads? Is it anemic and not as useful as a dangerous game "stopper" rifle? I assume that shooting full bore loads would not be safe in these rifles, regardless of regulation?
Thanks! 
I own an old double rifle from Webley & Scott, built 1909, which was initially regulated for an 650gr bullet and 90gr of cordite. It was reproofed again later for an 750gr bullet and 90gr of cordite. However, the previous owner always used Kynoch cartridges with full charge, 750gr bullet and 100gr of cordite, and I also used similar modern cartridges caliber 577NE several times in the rifle without any problems.
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Re: .577 NE 3 inch - 650 gr / 90 gr Cordite Questions