Clip and charger collectors may be interested that early versions of the EM2 rifle had a magazine loader permanently attached to the magazine, which was deleted from later versions of the rifle. A photograph exists from a handbook showing this magazine loader in action. It is holding a Mauser-type charger with .280-30 cartridges, but unfortunately the quality of the photo isn’t good enough to show the number or type of lugs on the charger’s sidewall.
Many years ago I spoke to Herb Woodend about this, and he believed that this charger was in fact the quite well-known 60mm-long, Mauser-type charger with 3 sidewall lugs made by British Pens, marked “BP”. He based this opinion on the fact that it fitted the EM2’s mag loader, that its manufacture seemed to have been contemporary with the EM2 development, and that he could think of no other likely use for it. So far as I am aware he never located any documentary proof for this.
It may seem strange that the EM2 should use a 3-lugged charger typical of those made for the 7.92x57 Mauser rifle. However, it was derived from a closely similar one made by BP for the SLEM (Self-Loading Experimental Model) rifle, then in 7.92 calibre, developed by FN’s Dieudonne Saive and his team working in England during WW2. This SLEM charger required a single central sidewall lug, and it is probable that for experimental purposes it was later modified by the addition of the two outer lugs needed for the EM2.
After the EM2 project was abandoned, these 3-lugged chargers were sold off by the civilian gun trade as 7.92x57 Mauser chargers, the .280-30 and 7.92x57 cartridges having identical rim dimensions.