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Leverdude or someone else can correct me if I'm wrong here but...Redmist said:Well, the loading gate spring screw is tight, and the gate appears to be lined up correctly compared to the other 336's in the safe. There's simply nothing holding the round in the mag tube. I can depress the gate and look in with the action closed and the lifter does not seem to be high enough to hold rounds in the mag, but it's hard to know how high it should be to catch the rim. It that the only piece that holds rounds in the mag? If so, is there a fix short of replacing the lifter ? Thanks for your thoughts.
The carrier (lifter) only prevents the next round from entering the action as the "on deck" round is being fed into the bore. The first round in the tube is held in place by the lever and loading gate. If you load up one of your other 336's you'll see how the rim of the case pushes against the cut out of the loading gate. You'll also notice that just as soon as you start to work the lever, the round pops to the left (into the action). Likewise, at the very, very end (closing) of the lever, you can see the round pop to the right and against the gate.
If you look at this picture, #6 is the slant cut that helps hold the round in place with the lever gate (it also interacts with the carrier during cycling but that's not relevant):

I don't know if there is any difference in the 30-30 and .35 levers, I suspect not, so I would try swapping a lever from one of your other guns and see if it makes a difference. It's hard for me to imagine the lever has worn but it might help start isolating the problem.