Making .357 Sig out of .40sw

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IMR4320

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Just curious if anyone tried this. I have a load of .40SW casings and would be interested getting a conversion barrel for my Glock 22 to .357Sig. Now, I know these two casings are same by diameter and the Sig is only a few thousands longer than a new SW but most of my casings have stretched a bit making up for the difference. My only concern would be a little higher pressure of Sig compared to SW but conversion barrels have fully supported chambers. It would make a cool combination of my reloading supplies, as the primers are the same, powders pretty much too and I have a 115 or 124 grn. selection of 9mm bullets. Does this sound realistic before I get onto ordering the conversion barrel and getting the dies ?
Thanks for any info.
 
Don't want to be rude but why would you be using Berry's in a 357Sig? They are only designed for velocities under 1200 fps. The sig goes faster than that. Are you using the triple played ones? That is the only Berry's you should be using for the velocities the sig can generate. Just curious what you're experience is with the Berry's.
 
I have looked into the sig conversion for 1911 and Hi Power but not for Glock. The problem with the 9mm bullet and the necked down 40 case is you end up with a short neck on the case and the bullet shape does not give much of a flat for the shorter neck to crimp to.
Most 357 sig bullets are Truncated cone to provide a greater bearing surface for the case neck to crimp to.
It is not as much of an issue in the 1911 as the mag allows you to load longer.
I have seen lots of guys do it for 1911 / 2011 guns. You can make major power factor with 357 sig if you shoot. IPSC.
 
jawsman said:
Don't want to be rude but why would you be using Berry's in a 357Sig? They are only designed for velocities under 1200 fps. The sig goes faster than that. Are you using the triple played ones? That is the only Berry's you should be using for the velocities the sig can generate. Just curious what you're experience is with the Berry's.
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Doesn't seem to be an issue, I also use the berry's in my Deagle with full on loads, not sure where you heard they couldn't go over 1200fps. I use them because they are cheap in bulk and also go in the 9mm.
 
CanuckWR said:
Doesn't seem to be an issue, I also use the berry's in my Deagle with full on loads, not sure where you heard they couldn't go over 1200fps. I use them because they are cheap in bulk and also go in the 9mm.
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this is direct from berry's website.
Velocities depend on the caliber, but as a rule of thumb, we recommend you don't shoot our plated bullets over 1250 feet-per-second. Our 44's actually shoot best around 1150 fps. 45's are generally good at 850-900 fps. Our bullets are not recommended for magnum velocities over 1250fps unless the bullet description denotes a thick plated bullet with a higher listed maximum for velocity.
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that being said, i shoot them fast as well.
 
if your getting a new barrel , you might find a better fit with a 9mm rechambered to 357-40 . had one done by RK Custom for my para ltd from a spare 9mm & it works great . the only prob is the expense of a carbide sizing die .
 
I can't comment too much on the 357sig as I don't have one...
But I do have a custom 2011 9x40 open gun with a 9x40 standard top end as well.
1) I only use 40 brass resized to 9x40.
2) I only use jacketed bullets.
3) I have not found the 40 and the 9x40 to use the same components...9x40 works with magnum primers or small rifle, not standards as the 40 does. Also the combustion chamber seems to use different powders. I've used H110 with some success, SR4756 is quite pleasant but comes just shy of major in standard and Longshot is next on the list I'd like to try. In 40 my go to's have been RexII, 231 and tightgroup.
4) compared to the 40 it uses a lot more powder. In comparison to the 9mm it is about as fuel efficient as a blown hemi... twice the powder over a 9mm for an increase of about 300fps (give or take).
 
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