7mm Mauser resizing issue
Posted: 11 May 2017 20:45
I've started work on 7mm Mauser ammo. This is my first rifle ammo reloading experience.
Bought 100 once-fired cases, stamp says "W-W Super 7mm Mauser". Lubricated a few, setup the Lee 7mm Mauser sizing/decapping die to touch shellholder + 1/4 turn - per instructions.
Put first shell in, it goes up, up...and starts to resize the neck and comes to a stop about 0.150" into the neck.
You can see the big compression mark but it would not go any further. My bench bends and poor C-frame press will not go any further. You can see that the decap pin fits into the unsized case but will not fit into the partially resized neck.
Tried with the decapping pin removed - stops at the same spot.
The resized portion of the neck is .307 (outside diameter).
The neck size prior to resizing is .324
According to Lyman the case neck at this spot is supposed to be .3207
I have a case of brand new factory ammo and that has neck size of ... .312
What am I doing wrong?
Is it possible that the brass I have is a bit thicker? It is .015". Nope, (outside dia - bullet size) / 2 is (.3207-.284)/2 = .018
Bought 100 once-fired cases, stamp says "W-W Super 7mm Mauser". Lubricated a few, setup the Lee 7mm Mauser sizing/decapping die to touch shellholder + 1/4 turn - per instructions.
Put first shell in, it goes up, up...and starts to resize the neck and comes to a stop about 0.150" into the neck.
You can see the big compression mark but it would not go any further. My bench bends and poor C-frame press will not go any further. You can see that the decap pin fits into the unsized case but will not fit into the partially resized neck.
Tried with the decapping pin removed - stops at the same spot.
The resized portion of the neck is .307 (outside diameter).
The neck size prior to resizing is .324
According to Lyman the case neck at this spot is supposed to be .3207
I have a case of brand new factory ammo and that has neck size of ... .312
What am I doing wrong?
Is it possible that the brass I have is a bit thicker? It is .015". Nope, (outside dia - bullet size) / 2 is (.3207-.284)/2 = .018