The charge bar may be sticking on the up stroke of the handle. Be sure you don't have the shot and powder bottles screwed down to tight. I also put some dry graphite lube on the charge bar which helps.
Buy a drop tube ( the right side one ) specific to STEEL shot. And as you raise the handle lightly tap the drop tube to dislodge bridged shot.Very new to reloading I am a duck hunter, not a trap guy. I reload because they don’t make 4 steel/9TSS, which is what I load. My setup is a used but seemingly nice Mec 9000, pre-primered hulls, 1/4 oz TSS on the bottom of 3/4 oz #3 or 4. I think I have everything (almost) dialed but the issue is that about every 4-5th shell, I get only about half of the steel, and then, on the next shell, 150% of a load, which results in slippery floors and swear words. I am very conscious to get the handle all the way down, and release it to the top. I don’t feel any extra resistance when this happens either, so I don’t think it’s a crimp height not allowing a full pull, but I really don’t know.
Also, what is an acceptable variance from shell to shell? Components should add up to 1.48(ish) oz. 90% of my shells are 1.45-1.5. One out of 25 is 1.52-1.54. Every once in a while, I’ll get a shell or two that is something like 1.35. I’m thinking that most of this is related to the above stated problem, but not sure. When all goes well, almost no rattle and really fantastic looking shells. When it doesn’t, the crimp is always dished so bad the shot can just pour out the top. Would love someone with some experience to share their... well... experience!
Yeah, sounds like the shot is hanging (bridging) in the tube and only a partial charge comes out, only to be knocked loose and added to the next charge. You might help things by adding a little graphite to your shot, but the steel specific drop tube is the ticket. Steel shot is particularly bad for this and the bigger the shot size, the worse it is. It'll also happen with larger lead. I've had it happen with lead six shot back when I was loading some "experimental" loads.Buy a drop tube ( the right side one ) specific to STEEL shot. And as you raise the handle lightly tap the drop tube to dislodge bridged shot.
It’s easier to get forgiveness than it is to get permission. That works for me.My policy is to take first, apologize later..................I'm still alive after 37 years of marriage, but I do have some significant bruises.