If the bolt is contacting the breech face 3/4" before closing, I'd suggest you REALLY got the wrong bolt.
3/4 of an inch is WAAAYYYY out of line, or something else is going on.
I'd take out the bolt and bolt carrier and try to fit just the bolt into the trunnion by hand.
If it won't even start to rotate into the locking lugs, you simply got a bolt from some other type of AK or other type rifle.
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