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# How did it get this way

dtknowles
Member Posts:

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I found a case headstamped .338 WIN MAG W-W SUPER. The case is 2.619 inches long and looks like a .300 WIN MAG case including the neck diameter at 0.310 inches inside diameter. All the other .338 WIN MAG cases I have checked are about 2.49 inches diameter. I could understand if the situation were reversed as you can shorted .300 WIN MAG cases to make .338 WIN MAG but I don't see how you could lengthen them. Would it grow that much if you necked down a .338 to a .300 and fire formed it. It has the remnents of the factory crimp that look undisturbed. I think it is a factory defect what do you think.

Tim

Tim

## Comments

2,361✭✭✭10,928✭✭✭✭One of the most useful things about belted magnum cases is the belt. You can fireform all sorts of shapes and lengths as long as the headspace is set correctly with the belt and you don't exceed the amount of material required to make a new length. Making .300 Weatherby from .300 H&H is a good example.

Is that 0.310" dimension the measurement of the inside diameter of the neck?

If we accept:

- .338 Win. Mag. case is 2.500" overall

- .300 Win. Mag. case is 2.620" overall

- Your case is headstamped .338 Win. Mag.

- Your case measures 2.619" overall.

Then we can figure that the case was fireformed.

The first thing to do is measure the neck length. You can't have a .338 Win. Mag. W-W case measure 2.619" without getting that length from someplace. That 0.119" has to come from somewhere. The neck would have to be shorter than the 'normal' neck of the .338 WM.

If you have something other than this then you need to supply us with more information and maybe a photo.

Best.

8,682✭✭10,928✭✭✭✭But it doesn't explain the length:

"The case is 2.619 inches long and looks like a .300 WIN MAG case including the neck diameter at 0.310 inches inside diameter."

The .338 WM case is 2.500" overall.

As an aside, the 30-338 wildcat is the equivalent of the .308 Norma Mag.

Best.

7,734✭✭8,682✭✭810✭✭✭✭Tim

8,682✭✭810✭✭✭✭Length of neck 0.264 inches

Neck OD 0.342 inches

8,682✭✭