.303 brass to .410 reloading basics

[bigger bang]

i am looking to buy some brass 303 cases and to blow them out for 410 use as i use a lot of 410 shells.

the question is nothing to do with blowing thme out as thats been talked to death

what i want specific tiny details on is the convertion of the brass to standard shotgun primer use, so it stays legal to relaod with a uksg ticket

as far as i can see i redrill the primer pocket add a primer holder on the inside and recess the case to allow for the primer to sit flush

ok yes thats a very simple version of the events so heres the tiny questions.
1, does chaanging from plastic to brass change any details on the loading data?

2, by drilling out the back of the case to acept the larger shotgun primer has any case issues ?

3, can i just reuse the primer holder from inside normal .410 cases and reheat them back into place?

4, what is the exact hole size required for a friction fit on the primers and as i plan to ream after drilling what sizes should i be looking for?

[bradaz11]

why would it not be legal to reload with normal primers on a shotgun ticket?

you can show you are reloading 303 cases to 410, so need primers for 303 brass, so why would that be illegal?

[ovenpaa]

Shotgun primers vary by manufacturer so measure a batch before deciding on a hole diameter and test a few as the hardness of the brass will vary by manufacturer. I personally form primer pockets as a boring operation on my brass. I have attached an image of an early version of my 8 Bore case (It has changed significantly in other areas since then!) I used CCI SG Primers and they worked well however I would still suggest you experiment to determine the best diameter for your application.

For .410 I have only ever loaded brass and my loads were finalised by experimenting and a pattern plate.

Out of interest why can you not use rifle primers in a shotgun if you are using rifle brass? You can or at least used to be able to buy the copper primer cups and I was even given some quite recently.

[Lever357]

You can buy .410 brass cases commercially, Magtech do them.

[bigger bang]

so first up many thanks for the replies here a few pointers

i want to go to shotgun primers as it is not allowed to buy rifle primers with a shotgun ticket so to other people it has to be shot gun primers fitted

yes you can buy magtech brass shells but not in the uk, the only place i have ever heard of them being sold is Kranks or clay and game and neither carry tham anymore, also at £1 each and still the requirement for the rifle primers is there as well, so not availble , expensive and no primers makes it back to square one.

thanks ovenpaa for the info, reading the history books every one used brass shell cases at one point but all the reloading data is for black powder its so old, modern powders are completely different so the brass and data dont match.

what i want to do is run a few dozen shells out in batches of ten and then run them through brum proof house to compare results after that i can then decide on a set few styles that suits me best

[Lever357]

Valmount Firearms advertise the Magtech brass but they are £1 a case.

[ovenpaa]

Ah, I see now why you are not using rifle primers. Any reason for putting them through the Proof house, do you have plans to sell the loaded brass?

[Sim G]

1, does chaanging from plastic to brass change any details on the loading data?

2, by drilling out the back of the case to acept the larger shotgun primer has any case issues ?

Even going from one brand of plastic hull to another brand of plastic hull itself can cause issue with load data.

Drilling the case head to take the larger shotgun primer will weaken the brass.

I have heard of someone having a condition to their SGC to purchase rifle primers for the loading of cartridges, but this could have been rubbish as the VCR Act is very specific. Drop your licensing dept an email.

[bigger bang]

Ah, I see now why you are not using rifle primers. Any reason for putting them through the Proof house, do you have plans to sell the loaded brass?

no i dont its because i am a massive coward

i reload the .410 plastic shells att the time i have three sets of data i use, think of it as a short medium and biggest round i need.

in animal terms its rats, pigeons and rabbits or for me its rats clays and close pigeons. but i have never reloaded a brass case, so the data is slightly and it is slightly different, liking as i do the right side of my face and being a coward ( did i mention that already !)
what i am going to do it to turn out three batches of four cases per given set of data with a slight adjustment to each one.

once i have had birmingham proof them i will know what to load and what best suits me and my shooting and then its full time reloading in brass 410 for ever more

i have been asked quite a few times if i am going to sell the empty modified brass cases though and whilst its a good i dea surely we have to worry about come backs and legal beagles and so forth reloading is a very touchy subject

[bigger bang]

1, does chaanging from plastic to brass change any details on the loading data?

2, by drilling out the back of the case to acept the larger shotgun primer has any case issues ?

Even going from one brand of plastic hull to another brand of plastic hull itself can cause issue with load data.

Drilling the case head to take the larger shotgun primer will weaken the brass.

I have heard of someone having a condition to their SGC to purchase rifle primers for the loading of cartridges, but this could have been rubbish as the VCR Act is very specific. Drop your licensing dept an email.

i did and he said yes,

due reason and all that and its ok, even my local gun dealer has agreed that its a reasonable request to say yeas to

what i want to do is to look out for others to do the same as me so the full case refurbish is the route i want to take so i can picture it and post it here for every one else to copy if they want