Something I'm confused about. I have the primers, I have a good amount of brass, and I have the powder. I've got the dies on backorder, but they accepted backorder so I assume AT SOME POINT, I'll get the dies. So that said, I'm curious about bullets. They're .355, same exact as 9mm. But are they really different? I see .355 bullets listed for 357 sig, and then .355 bullets for 9mm. Can I take a 9mm FMJ 124gr and load it into a 357 sig case and it'll work? I'm kind of lost on the fine details here.
Reloading .357 sig
- Thread starter clay_fv
- Start date
- Replies 11
- Views 1,035
jjwestbrook
Happy to be here
will work fine i have used 124 flat points from RMR in both 9mm and 357sig
.355=.355........................Load away.
357 sig and 9mm boolits have a different profile. ive had issues loading them in 9mm and had to seat bullets deeper than I wanted because the profile is fatter and less tapered. so I would infer that a longer pointier bullet used in 357 sig would have its own challenges. maybe neck tension, maybe reduced case capacity, maybe feeding problems?
Last edited:
357 sig also goes a lot faster so the bullets have to be able to handle it. a good JHP should be ok but look at the mfg website for a speed limit.
I use 115gr FMJ Berry's plated for my plinking loads and they look... dumb. They work, but with the way they seat they don't look 'right' compared to a those ubiquitous 125gr JHPs. Berry's can be driven 'too fast', I think their speed limit is 1250 or something but for light loads to run at the range they've been ok for me so far.
If you really want them to go fast find some 90gr XTPs. I've loaded 9.5gr of CFE pistol under a 90gr Hornady XTP and they're clocking in at 1731 fps out of my threaded G32 (that extra 1/2" of barrel makes a difference when trying to get the most out of 357sig). No idea what that load is good for, other than getting high numbers on the chronograph.
There are a couple sets of 357sig dies (both new and used) on ebay right now if you want something sooner rather than later. I'm using the lee set with the extra factory crimp die. They're good enough for my purposes.
If you really want them to go fast find some 90gr XTPs. I've loaded 9.5gr of CFE pistol under a 90gr Hornady XTP and they're clocking in at 1731 fps out of my threaded G32 (that extra 1/2" of barrel makes a difference when trying to get the most out of 357sig). No idea what that load is good for, other than getting high numbers on the chronograph.
There are a couple sets of 357sig dies (both new and used) on ebay right now if you want something sooner rather than later. I'm using the lee set with the extra factory crimp die. They're good enough for my purposes.
OP
clay_fv
Well-Known Member
Thanks Jayne, though I've got a Hornady L-N-L. I'm in no hurry. I have a G33, but for plinking I swap barrels and turn it into a 9mm. As soon as my CHP comes in, I'm going to get something else, just the same, but more full size. 357 sig, but that I can very easily change barrels and mags, and turn into a 9mm. I've got a few hundred 357 sig cases though, that I'd like to reload. However, I won't shoot anything until/if this current crisis abates. Hence, why I'm in no hurry. 
jjwestbrook
Happy to be here
pretty much i also loaded some with 147 jhp that did well another trick i learned was 357sig dies do not come in carbide therefore you have to lube the cases i used to run my 357 brass first through a .40 sw carbide die then through the 357 die made it much easier to size
As mentioned profile. Truncated cones and wide meplat hollow points generally. It is somewhat determined by the length your mags/feeding will handle, round noses can end up with ogive under the case mouth seated deep enough. Fun round to play with.