It kind of looks like you are trying to pack the case to full. What is the entire list of componets, wad type--might be wrong wad for the load, amount of powder, case type--I see it is a rem STS case but is that what the reloading book calls for(different cases have different volumes & tapers inside ). I guess I'm asking are you following the reloading book 100% on the load. What is the reloading book, what does it call for powder type and grains, what does it call for as case type, what does it call for as wad type, what amount of shot, what does it call for for primer(this won't make a difference on crushing the cases, but it will make a difference on load pressure). If you are following a reloading book completely, then it is caused by the final station on the press(crimping station) not being adjusted right.. The Mec manual will tell you how to adjust the final station for a good crimp. Also a solid post wad(has a fixed lenght) will cause more crimping problems than a collasible(collaspes inside the case to various lenghts to fit the load) type wad. It's kind of hard to give you a specific answer without me being there. Hope I helped a little
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