Options for expander for 300blk lead. Can I use an oversized neck expander when size

[taymag]

Ok.. so in search to find a way to load 300 blackout in one rotation on a LnL while still using a powder cop I have been hard pressed to find an answer... Obviously 9mm can be done with the powder expander (PTX) so that's where I am going with this

Here's my new idea, tell me if I am missing something in my thinking. Since I would need an additional station for expanding the case mouth and flaring (usually a Lyman 30cal M die) could I get an oversized resizing stem for my sizing die (.310 or .311) to resize the neck for cast then use the universal powder through flare funnel for a little belling inside the powder throw?

Seems like this would work and eliminate the Lyman M die by doing the same thing it does...

[IraqVet1982]

I've read of people using the 311 expander from 7.62x39 dies.

[taymag]

I've read of people using the 311 expander from 7.62x39 dies.

But is my thinking correct?

As for the .311, 2 our of 3 of the 300blk bullets I use are .310 and the custom expander is only $10 so I don't want to go up to .311 just to save a few dollars. Aren't resize dies normally .001 below (so .307 for the one that comes with the set)? Just wondering if I should go .001 below my cast size or if there is a different rule here

[BK7saum]

I usually go 0.001" below my cast boolit size. That is about all the springback of a case neck anyway. Any more undersized and you are just expanding/stretching brass with the boolit and risking Swaging or deforming it in the process of seating.

[taymag]

I usually go 0.001" below my cast boolit size. That is about all the springback of a case neck anyway. Any more undersized and you are just expanding/stretching brass with the boolit and risking Swaging or deforming it in the process of seating.

So will what I posted work? Just looking for a confirmation and a way to bypass the Lyman M 30 cal expander

[BK7saum]

Roughly, yes it should.

Depends on the expander? Some 308 expanders are 0.305-0.306" I would expect a 7.62x39 (311) to be in the 0 308-309 range.

I use a 31R lyman expander for my 300 whisper. It opens the case necks up to about 0.309. A 0.3095 boolit is a snug fit and does not swage the soft boolit.

[taymag]

Roughly, yes it should.

Depends on the expander? Some 308 expanders are 0.305-0.306" I would expect a 7.62x39 (311) to be in the 0 308-309 range.

I use a 31R lyman expander for my 300 whisper. It opens the case necks up to about 0.309. A 0.3095 boolit is a snug fit and does not swage the soft boolit.

I would be ordering a custom expander from Lee, guaranteed to be 309. So I should be good with what I am doing? In my head it sounds right, but I have only been loading on a simple single with expanders for a Lee auto disk for the past year, I just want to make sure my idea is correct when finding an idea similar for the Hornady powder measure with the LnL.

So would the new expander in the sizer plus a universal funnel in the powder measure (to flare) be equivalent to the 30r idea? (opening a station for me...)

[runfiverun]

on my Dillon I swap out my 3095 ball in my rcbs set for the 306 that come in the 300 set.
then I use the flair die to drop the powder and put a little flair on the case mouth.

[taymag]

on my Dillon I swap out my 3095 ball in my rcbs set for the 306 that come in the 300 set.
then I use the flair die to drop the powder and put a little flair on the case mouth.

Good to hear, so basically the exact same thing I was explaining and wanting to do?

Seems like the most efficent way but since I found next to zero similar topics I figured I had to be missing something that was going to make it not work

[Fishman]

I guess I don't see the need unless you are seating and crimping on different stations. I set mine up with the sizer, then a m-die, then powder drop, then powder check die, then seat/crimp. With all of the .300 blk loads I have made, the powder charge fills the case, so setback is not an issue and so my seat and crimp die is just fine. I personally would want to sacrifice a little on the crimp precision and maintain more precise expanding.

[runfiverun]

yeah pretty much what you want to do.
I use that same expander for other 30 cal rifles that use a 310 or so boolit.
in the Dillon I use the 30 carbine powder funnel to add the flair, if I had a 32 cal funnel I would use it [or polish it down] if it measured out properly.

[Cowboy_Dan]

Powder through expanders from any .30/.32 caliber cartridge will do what you want. Some of them may need some polishing and perhaps a longer die body. I would just get the one from the longest cartridge, or maybe get the insert and die body seperately from the spare parts section if I could.

[WebMonkey]

I use the 303 british decapping/expanding rod in my 308 Winchester die.
just right for my cast projectiles.
ymmv
'monkey

[Moonie]

I have been using a powder through lee expander for 30 luger however recently I've been using the NOE expander and like it better.

[taymag]

I have been using a powder through lee expander for 30 luger however recently I've been using the NOE expander and like it better.

Edit.. nvm

[fredj338]

Lyman 30 carbine 'M' die works. You could add one to a 5stn progressive.

[Moonie]

I have been using a powder through lee expander for 30 luger however recently I've been using the NOE expander and like it better.

Thinking about this, it might be a 30 carbine expander, really don't remember and it isn't marked (I got the insert by itself)

[TimberTec]

I made my own.... 300BLK PTX expander
170901

[taymag]

I have been using a powder through lee expander for 30 luger however recently I've been using the NOE expander and like it better.

With the Hornady measure?

[Boolseye]

With the Hornady measure?
NOE's solid expanders are designed to fit in the lee universal expander die. Al makes a million sizes for these.
He makes far fewer powder-through-expanders, which are designed to fit in Lee expander die bodies. Whether a Hornady measure works in a Lee expander die I can't say.