You guys having priming problems; the bench has to be stable, no wobbling around, no jumping up and down as you cycle the press. I have a 3/4" black iron pipe with flanges threaded to both ends. I adjusted them so I have to lift the bench 1/8" to get it under the bench top. This is right under the press. The bench weighs 125# empty, I have about 300# of bullets, casting ingots, and tools helping to hold it down. It doesn't move. That's what you have to do, let it bounce around, you'll have problems.
On a LM, load up the primer tray and then cycle the press. No brass installed. Look at how the primer is just balanced on the post. Nothing holding it in place. I would cycle the press thru a whole sleeve of primers and just watch what's happening. Pick the primer off the post before you do the next one... When you get to last 4 or 5 primers in the tray, you might see the primers not loading. You need the weight of most of a full chute to make them load. So look at the primer tray; don't just run it until you run out of primers and then blame the tool for your ineptitude.
The only time I had priming issues was running crimped primer brass. The decapping pin was knocking the primer out, but the new primer was hanging up on the crimps and not install. So that one was lying there when the next primer came down the chute for the next cartridge. There's only room for ONE primer down there, so that one would get sideways or mashed together with the first one. Solution was to ream the primer cups on 100% of range brass. When I picked up my own brass, that wasn't crimped, didn't have a problem. Last thing is don't short stroke, it's all the way to the top stop and all the way to the bottom. Only take it 96% up or down, it won't work. Operator error.
