I am interested in CZ550's loads simply because we don't get ramshot powders here in Australia but I can get RL17 no probs. However, how do you know whether something is safe given there is no reloading data for it. This is not to [bleep] CZ, it is a genuine question. I have been to his site, read the loads and wonder what the pressure being generated is.
I am often cautious of using internet loads but appreciate that there are times when limited loading data is available, as is the case here. I also like the fact that people pioneer and experiment, otherwise improvements are often missed...however when things go bang close to my eyes and face, I like to know the testing has been "proofed" prior to pulling the trigger.
(No offence meant CZ550 if any was taken)