I was shooting Remi Golden Bullets through my 617 today. In the past, sometimes when I pull the trigger almost to breaking, but hold it there for a few, sometimes the gun will lock up and I can't finish the trigger pull. And then it is really hard to release the cylinder. I have had this happen in the past. But today it happened a few times and I was wondering what was going on? Today I shot 50 rounds and it was starting to be very hard to push the extractor to get the bullets out. But it may have been attributed to the shells pictured below? What are your thoughts? Has anyone experienced this before? It was the locking up part that has me frazzled. The extractor part I think is due to dirty cheap ammo. But I am new to this and I'm not really sure. Any thought are appreciated. For note, the bottom picture are the left two shells in the first picture.