04-12-2012, 06:04 AM
.276 Pedersen wasn't developed until after WWI. The British developed the .276 Enfield prior to WWI, and IIRC intended to switch to it from .303, but the onset of war cancelled that plan.
![[Image: cartridges.jpg]](http://photos.imageevent.com/badgerdog/cgnmilsurpknowledgebase/britishpedersensemiauto/cartridges.jpg)
Might you be thinking of the Pedersen device, created during WWI to convert M1903 rifles to fire .30 Pedersen ammo, semi-auto from detachable magazines?
![[Image: Pedersen01.jpg]](http://www.remingtonsociety.com/photos/Pedersen01.jpg)
![[Image: img594.jpg_thumbnail0.jpg]](http://pictures.gunauction.com/5093202347/10907962/img594.jpg_thumbnail0.jpg)
Might you be thinking of the Pedersen device, created during WWI to convert M1903 rifles to fire .30 Pedersen ammo, semi-auto from detachable magazines?