  == Metric cartridge data ==  Please can you look in on Talk:.308 Norma Magnum. I noticed that the article had inconsistent values. Now I notice that the manufacturer is Swedish although the product seems to be for the US market. I wonder whether source data is metric. I looked at: . I also navigated via their 'Ballistik' menu to 'Ballistik metrisk' and 'Ballistik US' (using Internet Explorer).   Perhaps some values are hard metric (e.g. velocity) and others (e.g. weight) are not. This the website itself provides a good example of why we need source data to be clearly distinguished from converted data. You seem good at digging out source data and your thoughts are welcome. Regards   