It is slower to reload Berdan primed cases. There are three methods to remove the spent primers. All take about the same amount of time and all work well.
RCBS makes a special decapping tool that grips the extractor lip on the case, penetrates the primer and allows it to be levered out. That seems to be the most common method.
Another method is to place the case onto a block that has a hole in the bottom, fill the case with water and with a very close fitting ram installed, smack it with a hammer. The hydraulic pressure usually pushes the primer out.
The third method is to make a tool with two prongs that are long enough to push the primer out when tapped with a small hammer. Very similar to the LEE Loader system. My punch has only one offset prong, made from a number drill to be slightly less diameter than the holes. The punch body can be brass or steel.
I reload GP11 brass. It's very good stuff and expensive when you can find it. I'm lucky because my local gun shop carries it but even then it isn't cheap. I'm not blaming the shop because his price is quite reasonable in comparison to other shops.
6.5x55 and other brass sells for $75/100 and is made by PRIVI, darn good brass.
I also reload my old 8x56R/8x51level/6.5jap/and other Berdan primed brass. It's good brass and I have the time so why not.
Berdan Large rifle primers are available from Canada Ammo, a banner sponsor for $30/1000 plus shipping of course. They usually provide free shipping on orders over $100. Not sure if they still do.
When brass costs close to a buck a round, after taxes and shipping that is getting pretty expensive. IMHO there is no reason not to use that Berdan primed brass if you aren't pressed for time. I have even experimented with the steel cased stuff and it reloads very well. Not sure about what longevity would be like but it isn't any more difficult than any other case.
If you have very hard to find cases like the 8mm Kropatshchek in either the short or long case, you basically don't have any other choices. Steyr just didn't make enough rifles for the Portuguese and not enough rifles have survived to make it worth anyone's while to set up extruding cases for it. The Kropatschek itself was a bit of a throwback. It was the last repeating military rifle to be built for black powder cartridges with lead, paper patched bullets. Later it was loaded with smokeless powder and fmj projectiles.
If you are time constrained, just purchase boxer primed cases as it isn't nearly so time consuming.
I had an old LEE aluminum press set up for hydraulically removing Berdan primers. It was outside though and because it is a WET process it is messy. Also, in the winter it can be darn cold. I still use that set up in the summer.