How often do you come across Berdan primed cases? This is a first time for me. I guess I lead a sheltered life...
Expect ALL European military ammo to be Berdan primed. Expect European commercial sporting ammo (not made for US sale) to be Berdan primed, and be pleasantly surprised if it isn't. and in this case, European includes Great Britain.
The ironic thing is that the Berdan system, used in Europe, was designed by an American, and the Boxer system used in the US was designed by a European (an Englishman if I remember right).
The only time reloading Berdan primed brass is sensible (and never cheap or easy) is when the ONLY source of brass is Berdan primed cases.
In any common caliber today, fired Berdan primed cases are good for scrap metal, only.
One fellow I knew years ago, was a brass rat, (all reloaders tend to be) but he was a less than well liked fellow, mostly because of his personality, and he wouldn't go shooting with us, but would zoom out to the range/shooting spot after we left to grab whatever was left on the ground.
One time we fired a couple hundred rounds of European milsurp ammo (Berdan primes) and one box of LC match (boxer primed), which we left. He apparently picked up one of the LC cases, and then scooped up all the rest of the brass.
A couple days later, he was in the gunshop, bitterly complaining about how he had broken several decapping pins on a "bad batch" of LC brass....
We just kept quiet, and smiled.
If the brass isn't US commercial, check it. even if it is, check it, off center flash holes (not unknown) can bend or break decapping pins, too!