Member "Parashooter" published a good article in the Technical Articles for Milsurp Collectors and Re-loaders(click here)
Headspace 101 for .303's (click here)
Also, you might want to try our Google CSE custom search engine located in the top right corner of the web site titled Search Milsurps.Com. It only searches our site using Google techniques and can be quite fast and more efficient then what other gun sites on the Internet utilize. For example, in your case, type in the words enfield headspace and see what happens. There are over 10 pages with dozens of old threads with many with pictures that you might enjoy, covering various aspects of this topic.
Hope that helps ..
Regards,
Doug