I just had a look at my Match 64 sporter. The slot is for retaining the bolt in the bolt way. It has no real part to play in the integrity of the bolt while shooting the rifle. I would go with making it back up using one of the liquid metal fillers. I am guessing that the bolt is riding up on to the bolt stop and causing the bolt to jam in the bolt way. When it jams have you tried puling the trigger back, this should free the bolt and allow you to either remove the bolt or push it forwards.

Alan