Hmmmm I have not worked with this much since having the chamber cut but yes I do have a .303 Imp:-

As you can see. I asked for a .303 Epps and got this which is not an Epps and has a silly short neck. Was not amused by that. Anyway the rifle was re-chambered as it has a really tight chamber and it was causing me grief as it was impossible to re-size any cases to fit. Factory shot OK but reloads were a no-no. The rifle is a century Arms P-14 sporter which I believe they called the Centurion bu although they removed the ears they did so crudely and so far I have never found any scope mounts to fit and century refused to even answer my queries about it.

The rifle is sitting in the cabinet whilst I get on with other things but it's is on the list for a re-do. The rear bridge will be re-machined to accept commercially available mounts. The stock will be re-shaped to remove the horrid belly to the fore stock and iron sights fitted. I also acquired an adjustable match trigger for the P-14 which will require a bit of filing to fit but I may just do that.

That was it with an alloy cobbled up scope mount and the stock really does need improvment and removing of that horrid brown stain. Underneath is a very light beech no doubt.

As for forming brass may i suggest that if you can acquire some of the Greek HXP as it's excellent brass and gives a very good service life.