You can guarantee a capped weapon with +250 augs and +30 enhancements by waiting until 10 mins before server reset.
Make the core but if it doesn't come out capped do not actually craft it.
Keep the window open until server reset and when the server comes back up you will get all of your core components back. Rinse and repeat until your core is capped. Repeat with the skin. It will take a while but it does work.
A guy on farstar is currently selling his exploited weapons for over 200mill.