Will dies set in the hornady bushings be correct for both presses or do I need to reset them each time? It would make too much sense to have multiple presses with the same bushings and the dies could swap without tinkering..

I have a LNL and a LYman T-Mag II. As for an answer to your question is no they wont interchange with out adjustment. Biggest reason is the LNL bushings have a raised lip of about 1/8th inch. I've personally never had an issue because I use the T-Mag press to do single stage case prep duties almost exclusively (de-priming, sizing, swageing, trimming). How ever if you really want the two presses to be interchangeable Hornady makes a conversion kit for the rock chucker.

http://www.hornady.com/store/Lock-N-Load-Conversion-Kit/

Good luck.

Edit: I'm an idiot and didn't read the question correctly. Disregard the above post.

I have both presses - you need to reset the dies or have duplicates to avoid resetting . . . unless you can do this:

http://ultimatereloader.com/2009/06/06/calibrating-lnl-ap-and-lnl-classic-hd/

That would be so nice to have. I think I'd pay $20 for that simple ring. I'll have to measure my L-N-L and single stage to see if it matches up to the video or if every set of presses is slightly different.
I prefer to develop loads on the single stage, then do mass loading on the L-N-L.

I had this exact thing done. The difference will be different for each press. You really need to measure it first. I need a .11" round shim.

I had a local Smith make mine on a Lathe. Since he is on the other side of town, I mailed him a piece of 1.5" aluminum round stock. He mailed me back the completed piece. He also gave me a couple days to verify it before he removed it from his lathe (in case he had to cut another). Awesome customer service.

Anyway, if you can't find anyone local, PM me and I can get you his info.

I have a slight disagreement with this video though. I think you should be measuring the single stage press at the top of the cam before it cams over.

I haven't done mine yet, but if you measure the cam-overed single stage and compare that to the LNL-AP at the top of the stroke you will get the wrong measurement IMHO.

Agreed?

I have both and I absolutely love them. I haven't needed to switch between presses yet, I typically have certain things I do on each press and keep it that way. So I mark which press the dies are setup..

Had a similar thought - he's ignoring camover. I don't know how much difference it will actually make, but I'd probably measure while moving the ram through it's full upward range to see the difference between the highest point  and where the ram is when the stroke is complete.

Then I'd think a bit about whether the press actually would reach the same high point when under pressure against a locked-in die lol.

Then I'd have the shim made :)

I have a LNLAP, and have converted my RC to use the Hornady die bushings.  I used arbor shims to adjust the height of the RC to match the LNLAP.

As a follow up, I think it is easier and more accurate to just seat a bullet and measure it.

This is what I'm going to do:

Seat a bullet with the LNL AP (it's longer than the classic so you won't have to pull the bullet to measure both).
Measure the bullet (make sure it's a FMJ or HP, no lead tip).
Now move the seating die over to the classic and press the same bullet with this press.
Measure again.

Doing it this way you are taking into account the cam over from the classic press and it's easier to measure!

Does any one know of a company that will make the spacer to specified measurements - preferably on line ordering?

I looked around locally and couldn't find a shop to do it.

I have both and would like to know this as well

Bump for more community input.

I matched my L-N-L Classic and RCBS Rockchuck to my L-N-L AP. I am a machinist, took a lot of careful measurement with a depth mic(not a caliper). I would guess the spacer rings would need to be made special for every application. With all the care I took with mine, all the dies are interchangeable with all my presses but still there will be a couple thou difference between the 3 presses. It is difficult to take into account the slack or flex that may be take up different amounts with the different operations.
It turns out this doesn't matter for even my precision rounds loaded in the AP as I had shown in another thread.

We used to fiddle with that when we had both.  We replaced the AP with a Dillon 650 and made it less desirable to try and adjust dies,  so now our new method is to get dies and run them on the classic to work up a load, then buy a toolhead and load it progressively on the Dillon.  I mostly use the Classic to pull bullets now.

Agree... You can match them easy enough if you have the skills and tools. It is not as easy as one would think. I had a smith make me a spacer for my LNL Classic to match my progressive.
The spacer got me to .00x" (forget x but it was small). Essentially, the classic is a fraction taller now compared to progressive. I could probably take the spacer out and put it on sand paper to get it perfect. He even offered to make me another if necessary. I think I sent him 6" aluminum round stock. He tossed it on the lathe and had it done quick. He must have over 5" left (unless he used for something else).

Then I thought about it for a minute. Is the new delta all that important? IMO, it is not. For what I load, it just doesn't matter. I check sized cases with case gauge. Both presses size essentially the same when I compare 10 sized cases from each press. I can't be 100% sure since you can't size the exact same case in two different presses.

The other major die of concern is the seating die. I would be worried about the delta if I were worried about making ammo for 500+ yd shooting. Since most of us (including me) shoot at 100yd or less most of the time, I don't suspect I will notice. Also, it's easy enough to adjust seating depth on most dies.

So, I guess my point is you don't need a depth mic and you don't need to get too anal about it for 99% of what loading is done. You obviously have way more experience then me and I value your advice. If you can think of issues I am not addressing, please let me know.

I will email my Smith and ask if he still has the aluminum stock I sent him to make my spacer. If he does, he might be able to make more for cheap enough. He built two AK's for me from kits after I realized the tools would cost more than his builds. His pricing was reasonable and he was very responsive. He likes to do jobs like this (and AKs) in batches. So, it would probably make it more desirable if there are at least a few to do. No guarantees but fingers crossed.

Nope I agree, it don't matter much if they aren't exactly the same. A good stable load isn't real picky. A picky load isn't real good.

Sort of a late reply, but I have both LNL ap and LNL single stage as well. While the bushings work in both, the die depths are different. So you cannot swap from one to the other without resetting them.

It's not a huge deal to me, but it would have been nice not to have to worry about it when doing my match loads.

Read the third post.

You can make a shim to make them the same distance.

I did see it, thanks. I don't have access to a lathe to produce the ring so it's not so easy for me.