This is an old post and reply, but from Johannesburg: Yes I also had my CZ Shadow SP01 main spring 14Ib, recoil spring 11lb and preB disconnector installed. All IPSC legal. I was very concerned and surprised when at some point my gun went click instead of bang. These were using Wolf (Russian) primers, all of which went bang previously, 1000's of times. All the rounds went bang the second strike, the odd one after 3 strikes. Some of my brass is, well, old, at least 30 years and has many reloads. So primer pocket cleaning seemed a good idea. But I also had a look at my 550b. Firstly clean out the indexing ball, spring and hole under the shell plate, that let's you lower, the shell plate slightly (it all helps). You can adjust the primer seating depth on the 550b, but not easily in fact it's a real PITA. See the left bottom corner of page 5 of the 550b manual. The local Dillon guy did it for me. If you adjust to the maximum, it's evidently not a good idea. Using Federal primers solved the problem, into any old primer pocket, but they are getting scarce to impossible to find in the US, let alone SA. S&B and Fiocchi primers work as well, albeit now in clean primer pockets and set to about 0.005 below flush. Before I must admit it was a bit hit and miss. So now I must use a box of Wolff primers and hopefully these all work. If not I have about 7000 waiting for my open gun license. A side benefit is everything gets decapped and wet cleaned before it gets to the 550b, so reloading goes sweet! So bottom line is you can use soft primers or Remingtons (from an earlier post, really?), or you can seat primers properly. I believe that Federals are soft (and use a different priming compound) and Wolff hard. But everything else I don't know, but CCI's are supposed to be quite hard. Here in SA the cheapest primers are S&B, about 50% of everything else, but I did shoot 100, properly seated. But the box says for small rifle as well?
The importer of Wolff said he won't bring more in because too many Glock owners complained about light strikes! Or more likely not properly seated primers.