Thanks Stubbicat and Cat Wisperer, minimum sizing and minimum expanding is the what I'm after.    Thing is I've got the expanding covered.   I've got a .4065 expander which is exactly what I want.   It's the sizing that I've not got figured out with available dies.    .421 is more sizing than is needed or desired.   Ideally I'd want that for the

Chris, I had not.  Just did!   Looks like it is exactly what I'm looking for.   Thanks!!

Thought I had a brilliant and cheap idea of using a Lee Push Through Sizer at .427 for to neck size but that left a wicked ring at the transition of taper-to-neck, and, with the sizing part being at the mouth of the die, the press only allowed for a couple threads to catch.

nuclearcricket wrote on Oct 23^rd, 2015 at 1:33pm:


Pictures?
Design drawing?

(I'm thinking of using the 1-1/8 thread of the rockchucker for the holder for a bunch of bushings.)

Cat, I dont  have a print I kind of made things up as I went along.     However if you would like a print give me some time and I can make up a set. Most likely it would be 3 seperate drawings and I can send them to you as pdf's.
I did not make up a bushing for my 40-65 but instead made one up for the 45-70 and you can definately see the offset. I am not sure if I have that case laying around or not but it would be easy enough to run a case in and take a pic. The other caliber I made a bushing for was for my 44-77. My thoughts were that I only have 1 rifle in that caliber, I will only shoot black in it and no need to do more than neck size and maybe crimp a little and the bushings work just fine for that. 
When I use the bushing in my Co-Ax press, you do see a transition but its not overly noticeable but it is there, in the Lyman press it is very noticeable.  I will get things set up later on today and take some pics including the die and associated parts. 
I put enough thought into the die that I can use is for neck sizing, depriming , seating and crimping. It was an interesting project and most of the parts are made from 12L14 steel.  The remainder of the parts being either brass, plastic or tool steel (the bushings). 
Sam

Sam,   Thanks for the feedback on your transition.

And ireload2, thanks for all the feedback on die sizes.   Very helpful and exactly what I was hoping for.    

I may try lapping the taper angle of the 40-65 case body on my .427 Lee Push Through sizing die at the mouth to manage that transition before I invest $100 in a bushing die ($100 for die, bushing and open top nut).    Don't see why it wouldn't work, plus it would allow me to turn more threads into the press.   .427 would give me about .002 neck tension - that is "if" I didn't create an offset!    I need to figure what that taper angle is!

nuclearcricket wrote on Oct 24^th, 2015 at 7:56am:


I think this would make a good topic by itself - and if we do it right SOME manufacturer will catch the idea and market it at a reasonable price. 

The need for some thing simple and functional to do limited sizing on a C press has LOTS of applications.

Thanks for posting Sam!

Cat, if you look the drawing is there between the post and the first pic. The text is just a little small I guess and I wasn't thinking or the pics wouldn't have been quite so big but you do get the idea of how the die was made. I don't know what size the mechem bushings are, I just took a guess. I made my bushings our of A-2 steel and its hard to get a good finish on that material short of grinding it.  It might pay to purchase a bushing and then build a die around it.
Sam