1941 Winchester .303

[Bindi2]

yes Surpmil.
With good quality metal Brass in large chambers case head separation is not an issue at first firings. With poor metal quality brass in tight chambers case head separation still occurs at first firings.
Good quality brass is a deep golden colour almost brown, the poorer the quality the lighter and whiter the colour of the metal. As in all things man made there are exceptions the colour can be right but the malleability is not.
The British Military Brass specs had to cover these issues. I have NEVER had a case head separation using military ammo in any military 303. All case head separations have been CIVVIE brass