Hello guys.  I'm new to reloading for the .30-40 and will be shooting it in my 1898 rifle that has a very nice .308 bore.  A few questions.
Firstly, is there a difference between the thickness of the Remington and the Winchester Brass?  If so, I will circle back to this later in the post.
I found a random Winchester case at the range.  Brought it home and cleaned it, re-sized it in my lee FL re-sizer die, checked it for case length, and seated a Hornady 220 RN to 3.080".  It is just a dummy case with no powder and will be used for die set up only.  It cycles nicely in my Springfield 1898 with no problems. 

Today I went to the range and fired 6 Remington factory 180gr loads.  All went nicely.  Brought the brass home and tried to set up my Hornady 30 cal. (.308) neck sizing die.  I wanted to re-size the neck as far down towards the beginning of the shoulder as I could without actually getting to that point.  Then I added the expander and decapper back into the die.  At first I tightened it all the way down to the point where the mandrel gripped the expander tightly enough and found it collapsed the shoulder of the case.  I re set it by screwing the expander and the locking madrel down until I felt it touch the mouth of the case. The problem seems to be that the Krag neck is so much longer that it will not allow me to tighten the mandrel down enough for it to grip the expander/ decapper in place without tightening it all down to where it collapses the shoulder. 
1.  Am I doing it wrong?
2.  If not, what I found as an alternative was that if I just tighten it all down so it grips the expander and just do not cam over the press it does not seem to collapse the shoulder but it will fully re size the neck.  This leads to the next question.  My outside neck measurement on the Remington dummy case I made with the Hornady neck die with the 220 bullet measured .332" diameter.  The Winchester case I made with my Lee FL die measured .336".  Will this be OK?

Thanks for the correction on my vocabulary - you are correct. 
I figured it might be a difference in thickness on the two types of brass but I forgot to measure it on the range brass/ Winchester brass since I was not planning on using it for real ammo anyways.
Your point on using the FL die is valid and I thought about it  but maybe I will just set up the Hornady die the way you mentioned and call it good.  I would like to have the FL die set up for that job and the neck die set up for it's own job I guess. 
So, no real issue with the necks being slightly undersized?  the measurements in the Hornady and Lyman books show .338".

Thanks guys.  ...and yes, I like reading parashooter's posts too.  Especially on the Norwegian Krags.

I was planning on using IMR 4350 since I have a lot of it and have experience using it for my Norwegian Krag.  How many of you guys use a crimp and/ or magnum primers with this powder?  Not sure if I want to necessarily use the magnum primers but I have seen a few posts where people do so.
I also have some N-160, H380 and IMR 4895 but I was planning on just using the 4350 unless any of these others get rave reviews here.

Here are two Remington cases.  The first one (left) is FL re-sized.  The second is neck sized using the Hornady .30 cal (308) neck sizing die screwed down into the press as far as I dared without having the fully tightened collet crush the shoulder.  I might be able to get it a little further down but do I really need to?  I have about 2/3 of the neck re-sized.  You can see how the bullet I will use generally lines up with it. 
I was planning on a slight crimp as well.  I probably will start loading with about 37.5 grs of IMR 4350 and Winchester LR primers since that is what I know I have.  I may have some CCI's someplace.  Any concerns I am missing?

For what it's worth...  I use 4350 with my 220 gr RN bullets, and I use magnum primers and apply a light crimp with a LEE factory crimp die.  Butlersrangers is correct that a crimp is unnecessary... however, I seem to get nice consistency with the crimp. 

The jury is still out on the whole magnum VS standard primer, and there is good data either way.  I started using them because I was told I'd get a more consistent and complete burn with the slower-burning 4350, and I just kept on using them.  I load the Hornady 220 gr RN over 40.0 grains of IMR-4350 and a CCI 250 Magnum primer.  This is pretty much the modern equivalent of the original Krag round, and the only thing I shoot in my 98 for CMP matches!

Now, more on the crimping issue:  If I use a spitzer bullet in any of my Krags, and I DON'T crimp, then I will experience the bullets telescope into the case neck upon chambering a round.  This happens to me every time, and always results in the case being wedged cockeyed in the chamber requiring it to be pried free (actually spoiled a few good shots back in my hunting days this way).  Now, not everyone has this problem... but it's enough for me to say if you're going to load a spitzer bullet, you would be wise to crimp!

I've been crimping all along... including before I started using the 250 Magnums.  Never really had a problem with it.  Just enough crimp to prevent telescoping.

'BM1455' - That gentleman's experience, (2 reload case life), sounds like the exception rather than the rule for Krags.

IMHO - There must be something fundamentally wrong with his chamber dimensions, resizing Die, or techniques.

Most KCA members report their Krags to be gentle on Brass. There is a lot to be said for partial neck-sizing, routinely annealing case necks, and checking fired cases during shooting sessions.

I once owned a British Short Magazine Lee-Enfield, Mk-III, that was a destroyer of .303 Brass. It had a New BSA barrel on it! However, the chamber was sloppy for War & Crud and not designed for reloaders. My cases were showing complete head-separations on the second loading. I was using a simple 'Lee-Loader', which only neck-sized. The rifle ruined all my new Winchester brass, but, made me appreciate rimmed cartridge cases! (BTW - The .303 loads were quite mild and accurate).

Thanks guys.  I had a feeling he was being overly cautious with the two reloads thing.  I was planning on making my 220 gr about the same as the original loads so the sights worked well.  Working my way towards 40 grs of IMR4350.  Will test my .39 grn loads today if I have time.