.410 from .303

D

david doyle

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Hi Gurus:

I am desperate for cheap winter projects and I have always been curiuos about making .410 ammo from .303 brass. I have done the standard net search but I trust CGN advice more. Anyone have any experience doing this?

Thanks

David
 
The rims on .303 BRITISH are too thick for most chamberings. The rims can be thinned by removing brass from the front of the rim. .303 cases need to be fire formed to remove the neck and the case never really gets to be a perfect shaped .410 brass case. Because the brass is so thick at the base it never seems to fully expand and it always will look like a snake that ate a couple of mice. But using .444 MARLIN CASES works with no alterations.
 
The use of .303 ammo in a .410 is dangerous but I am unsure as how loading .303 brass that has been made into .410 brass can be dangerous. RR could you give your reasons. I do agree that .444 MARLIN is the easiest, if you can find the brass.
 
I know during WWII some old timers used 303 for 410 shot shells after they had to hand in all their guns to "slim Jannie Smuts".
Will see if I can find the article on just how they did it
 
That is why I asked! Thanks abunch guys. I will be getting some .444 brass. That rupture is a bit of a shock. Did that happen in the forming process? Seems like an odd spot for a failure. Makes a good case for always wearing your saftey glassses!

David
 
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I have tried to fireform .303 to .410. Didn't have one split, but the resulting cases looked awful, because the thicker head could not expand properly. RR got more expansion than I did, before the case split. Perhaps the load I used was less stout. .444 is a lot easier.
 
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