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Old July 8, 2022, 07:44 PM   #15
std7mag
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Join Date: June 23, 2013
Location: Central Taxylvania..
Posts: 3,575
Have to turn the necks. No.
Not in my experience.
The neck is essentially staying where it was on the parent case. Just going down in diameter.

If you had said 7mm-08 from 30-06, that's a whole different story!

I've formed 257 Roberts from 7X57 Mauser. Simple one step operation in a f/l die.
Again, necking down requires trimming.

The only case i've had to do more than that was 6.5mm Rem Mag from 7mm Rem Mag.
2 annealing steps & inside neck reaming involved.
The 6.5 is considerably shorter tham the 7mm case.
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