Reloading 9x25 Dillon ???

[my_old_glock]

Is it possible to size/resize 9x25 brass using a 40/10mm die and a 357 SIG die in two stages rather than buy a specific and expensive 9x25 sizing die?

I would think that you could resize the outside to 10mm first then switch to 357SIG and just size the top. If you had a progressive you could put the 40/10mm sizer in station 1, the 357SIG sizer in station 2, and the neck flaring die in station 3. Size all the brass first, clean it in a tumbler, than set up the progressive press to finish it up by adding powder, seating the bullet, and crimping.


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[The_Shadow]

The short answer is NO, the shoulder angles are very different with the 357Sig being more tapered and the 9x25 shorter and squared off.

However you can use the 357Sig neck expander to do the neck work or even the powder through the expander setup (if so adjusted) for the 9x25Dillon by raising that die 1/8" from the normal setting. (I use a spacer ring for this operation.)



10mm         9x25Dillon        40S&W       357Sig         9mm

The Dillon dies are the way to go for case sizing/forming and seating and crimping, for both 9x25Dillon and 357Sig...LEE just doesn't work out as they are steel and not carbide...

[my_old_glock]

The short answer is NO, the shoulder angles are very different with the 357Sig being more tapered and the 9x25 shorter and squared off.

However you can use the 357Sig neck expander to do the neck work or even the powder through the expander setup (if so adjusted) for the 9x25Dillon by raising that die 1/8" from the normal setting. (I use a spacer ring for this operation.)



10mm         9x25Dillon        40S&W       357Sig         9mm

The Dillon dies are the way to go for case sizing/forming and seating and crimping, for both 9x25Dillon and 357Sig...LEE just doesn't work out as they are steel and not carbide...

Thank you. I was looking to be cheap.

I wonder if I could take a 357 SIG chamber reamer and ream a 10mm to 357 SIG conversion barrel a little deeper then use the 357 dies dies?

I know; probably more trouble than it is worth, and the 357 SIG reamer costs the same as a Dillon 9x25 die.

[The_Shadow]

That might work but you will have you own wildcat cartridge and the case forming may not be easy and require fire forming. 
I had my LEE 357Sig dies start maring the 357Sig cases during regular sizing, even using case lube...The Dillon dies actually have dual carbide sections in their 357Sig and 9x25Dillon dies, that do allow sizing without any lube.  The Dillon dies are well worth the benefits & extra cost.

[my_old_glock]

I drew the two different cartridges (357 SIG and x25 Dillon), and overlaid them so their tapered sections touched.

This is what I got.



There would be a 0.005 void between a long 357SIG cartridge and the 9x25 chamber. I doubt that would make much difference in safety or reliability. A regular 357 SIG cartridge probably expands that much in a loose Glock barrel; especially if you get the Glock smilie. The only thing I can think of is that brass would not last as long.




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[The_Shadow]

my_old_glock, it may work, provided you don't have a headspacing issue to hold you cartridge out of battery.  The 9x25 has a sharper radius at the case neck to maximize powder space.  You need to hold the case head = to 0.000" flush with the barrel hood or < 0.002" below.  This is to minimize the case stretching and reworking.

With that said, what will happen is the case neck will get worked and you will see splits and or separations of the case neck all together.  This tends to happen with the 9x25 anyways within a few reloadings and firings.

[my_old_glock]

my_old_glock, it may work, provided you don't have a headspacing issue to hold you cartridge out of battery.  The 9x25 has a sharper radius at the case neck to maximize powder space.  You need to hold the case head = to 0.000" flush with the barrel hood or < 0.002" below.  This is to minimize the case stretching and reworking.

With that said, what will happen is the case neck will get worked and you will see splits and or separations of the case neck all together.  This tends to happen with the 9x25 anyways within a few reloadings and firings.

I have been thinking the whole thing over. Although I like flame throwers and hand canons, I can't think of anything I might encounter (in the wilderness) that couldn't be stopped with a fifteen 10mm rounds, but could be stopped with fifteen 9x25 rounds. I now figure I don't need a 9x25 handgun. I like having different options, but I don't think I need a 9x25 option.

Thanks for your help.





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[The_Shadow]

I'm not trying to discourage you, just trying to provide insight to what you might encounter.  The 10mm is what it is, and it is a great cartridge, when loaded to its potential!  So, I can't argue with that!

You're welcome, let me know if you need any help!