Recently purchased a Lyman turret press to accompany (not replace) my Bonanza Co-axial press. Using the same expander die (RCBS) on the turret press appears to be deforming the brass slightly on one axis enough so that the loaded rounds will not chamber in my Para. (Checked my crimps) I've adjusted the table stop to spec, and for trial purposes even beyond. Almost to the point of restricting free rotation of the turret. Still seems to deform. Barely visible. The table does rock on it's center a bit when the round enters the die. I don't want to over-tighten anything, so being a bit apprehensive. I dis-assembled my Para and my 4506 so that I could check loaded rounds in the chambers more easily. No problem with the tolerance built into the S&W, but the Para won't take them all the way. If I try a factory round, or one that I've expanded on the Co-ax, the Para will take them. So, chamber or press or die, three variables to consider. Anyone got any ideas.
O.K. four, almost forgot my imperfect self.

I could be wrong, but it sounds like the turret may be rocking back. Is there a way to shim the support on the backside?

Ya, I'm referring, probably incorrectly, to the table stop as the adjustment to minimize the rocking. I'm at work, so I can't recall the clearance, but did so according to spec. It still rocks slightly when the round enters the die. And by design, I really don't see how that can be totally eliminated?

First, you should talk to Lyman about this and see what they suggest. Second, you may need to align the die in the Lyman toolhead. The amount of play in two different 7/8-14 threads could be enough to allow the issue.

What I'm referring to is loosen the lock ring on the die. Screw it into the press to the proper position. With a sized shell in the shellholder, raise the ram and hold it in the up position while you tighten the lock ring and then the set screw. Then process a few rounds and see what happens.

BTW, you didn't mention lead/jacketed/plated bullet.

Ah!, yes now that you describe that in the manner you have, that is something I should have tried. I am use to the die "floating" and self-aligning in the recess of the Co-ax. It's been flawless since I purchased it in 1980.
Thanks, I'll give this a try.

BTW ...Plated...

I have a Lyman turret press and haven't had your problem. The nut that holds the turret on needs to be fairly tight but not extremely tight. I lube the turret with wheel bearing grease on both sides and that helps it rotate smoothly. Other than that I can't think of any other advice. Don

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"Don't worry be happy"

Thanks for the reply Don. I'm going to re-check the torque on the center-nut. Also, I'm going to change stations. It is possible that the one I've got the die in, may have been drilled and tapped not perpendicular to the flat edge of the turret. I can also check that with a square. I have lots of other Lyman gear and not doubting the quality, and would recommend it to anyone. This will likely end up being something I'm missing because I'm looking to hard in the wrong places.
Mr Moores advice will also be part of the troubleshooting.
Thank you both, I will post results.

It belatedly dawned upon me that given the force necessary to expand a case neck, you shouldn't be seeing any movement of the turrent head.

You don't by any chance have the die body in contact with the shell holder do you? Even then, there shouldn't be visible movement in the turrent head.

BTW-you might also wish to check the taper crimp adjustment if you moved that die from the other press also. Just because a die is properly adjusted in one press doesn't mean it's going to be so in another.

Hey Mr. Moore. Thanks for the on-going brainstorming. Have been re-loading for over thirty years and my income profession has proved to me that you are usually more successful educating a newbie than a guy like me whom will claim past practice as being the only doctrine to follow.
I have not had the time to test your first scenario. I will eventually make this press a viable and productive tool on my bench. It is a nice instrument and will be an asset I will keep.
Please keep watching for my updates.
Livestock, fence-line, homestead chores and a full time job all keep me from devoting the time I would prefer to be spending solving this issue. I will be logging what I'm doing to fix this and will share all info until resolved. From the feedback this thread has received the problem appears to be pretty much isolated to something I'm doing(or not doing) correctly. I'm not a fan of high production when it comes to feeding my shooting habit. Prefer to be precise and fussy.
Will be in touch, Thanks : Shaun

I have a Lyman turret press, I found after mounting it to the bench and testing it out the turret bolt was loose. After tightening the turret bolt, I adjusted the pin in the back that keeps the turret from tilting. I've had no problems with the press after fixing the two problems I found. Hope this helps.

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Life is good!

I had to raise the "table stop" more than Lyman's instructions said - basically tighten until it interferes with the rotation, then back off just a touch.

Personally I resize on single stage, hand prime, powder with loading trays, then bell, seat & crimp on turret. (just make sure expanded doesn't hit powder if you try that approach) Each turret head set up for 2 cartridges.

I was having somewhat similar problems but on my Coax press, which is all I use. I discovered that the plate that holds the jaws and the springs had (thru usage) become bent. It was higher in the middle and that allowed enough movement to cause the problem. A new plate from Forster solved it. So I'm guessing any wobble in your Lyman press could be the source of the problem.