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[Ray]

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[junkbug]

Thanks for that information. I have a single shot .410 that I was considering fireforming .303 British cases in. But my .410 will not close in the .303 rims.

[Bill in Oregon]

Ray, those conicals look mighty deadly to me. I probably would not want to shoot them through a tight full choke, depending on their diameter, how soft they are and how they were loaded, but I would bet they would make serious deer medicine.

[Ray]

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[GunnyMack]

My CZ will NOT close on 444 cases... just to let ya know.

[Ray]

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[GunnyMack]

Yup, rim thickness is why they don't close in my gun. However having 2 MEC presses for 410 I just load thug slugs, OOO buck and shot in any 2.5 or 3" , no need to monkey with 444 brass.

[Rockrat]

Try a piece of 9.3 x 74R brass and see if it fits. Read it works well in making brass 410's.

[ANDYLARSSON]

Thanks for that information. I have a single shot .410 that I was considering fireforming .303 British cases in. But my .410 will not close in the .303 rims.

When I was in High School I used to thin and resize the rims on 303 Brit cases for use in an Italian revolver a kid traded to me for a 22 rifle. We didn't know what cartridge it was (10 something millimeter) so I made it up as we went along. Its not difficult if you have access to a lathe. Doesn't need to be a big lathe. You could probably do it with a hand held drill and a belt sander if you have a steady hand and a good eye...

[GunnyMack]

If I had 9.3x 74r brass I'd have a 9.3x74 rifle and wouldn't waste brass for a 410. When I have thousands of hulls .