I found 500 Sellier & Bellot 5620 which appear to be the correct size. $142 shipped, $0.28 each.

http://www.dave-cushman.net/shot/berdan ... sions.html
Some interesting info there, need to read it.
How do you determine what size primer you need?
They are advertised in some gun shops here but stocks are patchy!

7 seconds ago#31 Back to the Berdan / Boxer problem. Having now managed to get hold of a couple of 7/32" - 5.556 mm drill bits I opened up the primer pocket in the 'working case' and inserted a .22 lr spent cartridge to 'sleeve' it for a boxer primer. Looks like I over did it - I always do! - t...

Dies arrived this morning - 22€ Customs Duty to pay but they came free so that's a good deal.
The collet I ordered was out of stock and looked like a long wait but found another on Amazon of all places. Due mid September

My RCBS Bullet Puller arrived yesterday but I am still waiting for the Collet........... Very frustrating!

https://www.gunsandco.com/carabines-172 ... -1943.html

Found in an Air Force depot in Denmark and bought by my Gun dealer mate. Bit too expensive for me I am afraid

Look what arrived today!!