Quote Originally Posted by Timmer View Post
Okay, first of all my Model #4 Mk1 rifle's head space is okay (gunsmith inspected). However what do I do when the headspace gets to big when the bolt head is currently a #4? Do I add a spacer? Try a different #4 head? Rebarrel? Any suggestions? Thanks.
If you want to learn more about the very basics of "headspace", Parashooter published an excellent teaching article in the Technical Articles for Milsurp Collectors and Re-loaders(click here)

Headspace 101 for .303's (click here)

Regards,
Badger