The instruction say to strip the bolt head, but I did mine last week without stripping and it seemed to work out ok. Headspace depends a little on your use, for a hunting gun you probably don't want it set to tight, but for my target rifle I set it to minimum. Using a go gauge I screwed in the barrel until I felt it touch, then backed off maybe 1/8 turn. With a piece of tape on the back of the go gauge the bolt will barely start down before stopping. I tested it with 3 different factory loaded rounds and all chamber, but you can feel a little resistance starting as the bolt bottoms out.
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