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I made two of these mandrels, One for pre WW2 actions with the internal C-ring and one for post WW2 and later rec without it.
The rifle is a .30x54R Improved 40 degree, The parent cartridge on right, Left one is 7.62x54R Peterson Brass trimmed to Lapua Length and fireformed to .30x54R. The one on the right is a 7.62x53R Lapua case with 10 firings on it so far.

Last edited by Harry_Knutz; 10/10/22.