Say no more...... The recoil and momentum imparted to the rounds in the magazine caused the noses of the rounds to stub into the front face which caused the dimpling shown in KevG's photos. I know it's hard to believe, but it's true - as you can see. The same applied to the Boys rifle and an aux. spring was inserted into them too.

In truth, I have never seen an example of this before now and the true explanation tested my mechanical engineering theory. I mean......, how could a lead, copper jacketed bullet/round do this to a mild steel magazine. But get enough bullets hitting the mild steel magazine face and it does......... The spring is simply a spring loaded buffer that works

Go to the top of the class Kev!