DO NOT FIRE YOUR RIFLE WITH A DIFFERENT BOLT OR BOLT HEAD without resetting your headspace. Bolts and bolt heads are different and will change headspace. Not saying you did that, but just throwing that out there for safeties sake.
1st I would check the bolt over real well and make sure there are no broken or binding parts. This LINK may be of help to you in that regard.
2nd I would check and make sure your barrel and barrel nut are tight and not allowing the barrel to move which would allow your headspace to change.
3rd If all that checks out, I would check the front of the action for debris on the lugs.
4th See if you have any build up in the chamber which may be causing some intermittent binding.
That's just the simple stuff to check out before going to crazy.
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