I use to buy only CCI primers but with the market the way it is I'm buying what I can get. So now I've got a mix that spans more than half of the current manufacturers. Is there any information available on the diffrent power factor from brand to brand. Really the only loading I'm currently worried about is my max load of 296 in my 357 S & W revolver. It would be nice to know were I might need to back it down some.