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Old 03-31-2012, 11:08 PM
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.410 and british .303 brass

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I read somewhere that the british 303 cartridge can be used in the .410 shotgun. I am very intereste in this. can someone assist me in this.. I wish to load buckshot, field bird shot, no slugs.. Thank you! Don Bell
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Old 04-01-2012, 12:40 AM
Gil Martin's Avatar
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Welcome to the Forum

Glad to see you here and hope that you post often. I have never heard of using .303 British brass in a .410 so I cannot comment. All the best...
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Old 04-01-2012, 07:05 AM
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Originally Posted by [email protected] View Post
I have never heard of this and what you are suggesting is VERY dangerous. The 410 maximum pressure is @13,000psi and the 303 is @45,000psi. What I think you heard and I have heard as well, but have never tried, is the making of brass 410 shotshell hulls from fireformed 303 British or 30-40 Krag brass. There are a few write ups on this online. You may have also been led astray by a conversion often made to SMLE rifles that convereted the rifle from 303 to 410.
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Old 04-02-2012, 04:56 AM
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One problem is that after reforming or expanding the 303 British case it is a lot shorter than the 2 1/2 minch 410 shell.

You should do a search for brass 410 shells, there has to be a supplier out there that has them. And chances are cheaper than 303 brass.
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Old 04-03-2012, 08:03 PM
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There is a ton of info out there if you search "410 brass hulls, or brass shells. Like this: http://www.endtimesreport.com/410reloading.html. An "intersting" site, to boot...
There once was an old man of Esser,
Whose knowledge grew lesser and lesser,
It at last grew so small
He knew nothing at all
And now he's a college professor.
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Old 04-08-2012, 03:02 AM
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Here's a picture:

The third one down is a reformed .303 British case. The bottom hull is a Magtech.
Using standard .410 plastic wads - which have to be cut back 1/4"- the hull will hold just under 1/2 oz of shot.
To do this conversion, you must anneal the .303 cases. Even with annealing, expect to lose 50% of the hulls to cracking at the neck/shoulder.
It may take more than one firing to completely reform the case.
The case head never blows out completely (same as when making .50-70 cases from 348 Winchester).
Other issues: different rim thickness and diameter - not all shot guns will hold the British hulls which have thicker rims and a slightly smaller diameter. Break open guns are best.
Patterns are OK in my gun.
"Only auto racing, bullfighting, and mountain climbing are sports. The rest are just games." Hemingway.

Last edited by Pete D.; 04-08-2012 at 03:07 AM.
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Old 04-21-2012, 09:18 AM
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Back in the 1950's I used to shoot a lot of brass cased 410s. They were the only cases which would cycle efficiently in my Parker Hale, bolt action 303 rifle / 410 conversion. It is a long time ago and I forget the maker of the ammo. The choking on the shotgun was so tight the only way to succeed in getting anything was to shoot it at static targets like a rifle, so I used to spend hours laying under a hedge watching a rabbit warren for a likely target. Brings back many happy memories, thank you for reminding me.
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