Well match was today. The good, the spencer drew a lot of attention, it looks real good. The bad, it jammed up during each stage so bad I had to hand it off. Not sure what the issue was, I had issues with extraction and feeding. On the first stage the first 3 rounds fed fine and the fourth locked up. I had to remove the magazine dump the rounds out and shake the jammed round loose. Took 5 misses on that stage, didn't look at my time because I was so flustered by the rifle I missed half of my pistol shots. Second stage made it to the fifth round before it jammed. This time it jammed up so bad I had to drop the bolt out to remove the round. Third stage I tried again, just about every posse member was offering me rifles, and was able to fire 4 shots before it jammed up. Last stage shot my wife's rifle and was able to finish under 50 seconds. I checked my OAL on my ammo and it is the same as the previous rounds that I used in the last range session. I can recreate the issue but could not see what or how the round was jamming the action. I took the stock and magazine tube off and tried feeding the rounds in 1 at a time so I could see how they are interacting with the bolt. It would seem that the rounds are not going in far enough so the end clears the breech face and it is catching it just in front of the rim and pinching it against the top of the receiver instead of pushing it forward. I see maybe three things causing this,
1. The bolt travels to far back and the round cannot travel far enough forward to clear the breech. Could try a new trigger bar and see how that works.
2. The bullet stop on the bolt (the shark fin shaped thing) is too far back not letting the bullet travel far enough forward to clear the breech. Could shorten the OAL or shorten the bullet stop.
3. The magazine spring is not providing enough tension on the bullet. This could explain why the first couple of shots are fine. Try a stronger magazine spring.
I will try the magazine spring and load up some shorter OAL rounds to see if that fixes it. Frustrating that just the week prior it was working like a champ. I really want to get this reliable enough to use in matches and not just fun at the range.