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Originally Posted by Will M
To know which cartridge it fires, a chamber casting would help and slugging the bore for an accurate bore measurement.
Who used 50 cal ammo at the time this was made? British was .577 and .450
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Early British cal for these rifles was 577/450 (a necked cartridge), not .577 AND .450.
Later models were in .303 British cal.
A pic of the early foil version of the 577/450 is shown here.
Stu