loading of .410 all brass hulls

T

triggerman42

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I am new to this endeavor and have a question.
I am in the process of fire forming some .303 brass into .410 cases.
It's going ok , but the brass is fire forming inconsistently , probably because of the different (mixed) manufacturers of the brass , varying age , and number of times fired , as well as the possible inconsistency of my annealing of the brass. I have not lost any to splits , but some look better , and closer to desired appearance than others. I'm fire forming them in a 12 gauge to .410 chamber reducer insert , and some of them need to be pounded out of the adaptor with authority . Then they'r too tight to slide back in.
I'm going to need a die to resize to proper .410 dimensions. I have an old single stage press.
Is a .444 marlin sizing die the way to go? What else will work ?
Here's another thought. I have a Lee .303 British hand load kit.
Could a machinist open up the old .303 hand loader die , essentially turning it into a .410 kit ?
I know the other parts of the kit wont function anymore as intended. But that's OK with me.
I just want a die to size to .410 dimensions .
The .410 kits are now discontinued + expensive , if you can find one at all. That is a shame in my opinion.
 
Why not use a .410 shotgun to do the fireforming? It sounds like you are turning this into a lot more work than it already is, which is a lot.
 
What would be the difference ? A .410 shotgun , and a .410 adaptor , both have .410 chambers , and both will fire form the brass . There is no more work, from one to the other that I can see. My question was about , what sizing dies would work .
 
B said:
I ask because never have I had to beat out a casing, especially while just fireforming. Neither have I had to resize them...
Click to expand...

Any pressure sign's? Why not use 1 type of 303 brass and get rid of 1 problem? A WTB ad on the EE would fix that
 
I tried to do this. I used a 410 Lee Enfield to fire form. Extraction was not an issue. Maybe a little lube on your case would help?

I found I had to anneal the brass thoroughly and it still took 3 firings to get brass. I had a 40% failure rate.
 
I would guess that the problem is with your 410 adapter. I have never had a problem with fire forming in a real 410 barrel. If you want to make the job easier you can just load 444 brass.
I haven't had to resize any of the brass that I have reloaded for my 410 but if you have to the 444 die should do it.
 
I agree . The adaptor was the problem . It's one of the Trade-X ones . It had visible, boring lines left inside from the drill or tool that cut the chamber in it. I have now polished it smooth and it works much better. I do still want to buy a die for occasional resizing. I guess .444 is the way to go. I don't own a .410 shotgun. I just picked up the adapter because I thought it would be nice to make up a few all brass .410 cases . I like tinkering , and enjoy little projects like this. It's always fun to make something from something else. Thanks all for the tips , and suggestions.
 
^^This. I have two old .410 Lee Enfield Ishapore specials. One is original bore, the other I’m going to say is 3”. I was going to set the world on fire with reloading for them, and discovered the MagTech .410 brass after I bought some .444 Marlin brass. Great fun to shoot the old girls. You can reload almost anything for the 3” one. Deaner and I had a few good laughs trying to hit a pop can at about 20 feet. Nasty load for close range is two lead balls. Hard to do any damage to the action with .410 loads! :p
 
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