You mentioned the bolt may not be able to drop down far enough. How could I tell if this was the problem? would it be a visual thing, if so, what exactly should I look for.
That's what we're trying to figure out and to be quite honest,
you haven't been too lavish with the information about your rifle and it's condition.
What I alluded to, in my previous post was,
whether or not you had an all matching numbers rifle, especially the bolt.
Does the bolt number match the rest of the rifle?
Does the hammer drop when you pull the trigger (even at the times that the misfires occur)?
Or does the trigger act mushy with no hammer drop?
You see, a misfire is when the hammer drops, the FP hits home and there's no ignition.
So we need to use the correct terminology when explaining the problem.
You might be having a "Failure To Fire" (FTF) which could be caused by mechanical problems.
You also weren't very clear on whether or not you gave the entire rifle
a thorough cleaning including the trigger group and bolt.
If you haven't,
then first thing, before you try anything else, I would completely strip the rifle and give it a thorough
cleaning as laid out in these instructions
Then if the problems still exists, we've at least eliminated the chance that there is some
foreign matter interfering with the function of the mechanics of the rifle.
Once we have that established, we can go on to other reasons for the problem.