How are you going to open the chamber ? New reamer it may well be oversized, reamer used to chamber is in the US Gun in Australia. If it’s not set up properly it’s not going to be true. Polish the chamber ? .003 off the outside of case at the rim lot easier than opening up a chamber .003 consistently . Mess one up it’s just a case not a chamber. 

Top gunsmith may be able to do it well. Most Mick will have easy access to in Australia won’t .

Boats 

Joe, you have to complain that it's inappropriate, then it'll get moved to 'off topic'. Who's been doing all this complaining anyway?

I found the same problem forming 32 miller short..
I tool out the shell holder and made a small plate to fit the top of the ram, then re-lubed them and ran the case to the bottom of the die lowed the ram and with a punch I that has a decaying pin in the end and inserted into the case and tapped the cases out,  Now any brand of case even starling will extract in my CPA

A drill press and file will make quick work of them Mick. Even  table top drill press will do just fine. Just need to find a piece of rod to fit the case mouth inside to protect it.

Small drill press will do just fine. Main thing is get someone to make up a well fitted mandrel . 

So much turning work with cartridge cases small lathe real useful . I have a nice big one now. Made do with a small simple lathe for years. If I had the space would have another miniature machine dedicated to cardridge cases.

Boats

You see the old small Craftsman made by Atlas on EBay 200 300.  Chinese mini’s 200.  Expensive are the Unimats still available well under a thousand. 

My son makes fountain pins from scratch. He was doing the wood work on a modern variable speed wood lathe . Also did Metal work on it, drilling, fits on the ink  barrels etc with files and papers.  Tapping worked well too.  Lack of a compound did not hold him back.

Gave him my 12 inch Atlas when I bought the Logan. I had used it for cartridge case work years.  Before the Atlas I did case jobs on a wood lathe with files hand trimmers and abrasive papers. He’s glad he has the Atlas but point is you can do good work with a very simple lathe. Main thing  is master the use of micrometers and indicators. 

Look at the photos of Harry Popes lathe in “Popes Barrels”

Anybody try just using bullets in the case mouth?  Stuff it in and chuck it up. After the case is finished, just toss the slugs back in the pile for remelt. Even your reject bullets become useful, hey?