alscott Posted March 3, 2015 Share Posted March 3, 2015 I know there is a difference the two above bullets, .355 vs .357. You can't load a .357 for 9mm, correct? My problem is that years ago I was reloading .357 sig and bought 1,000 bullets from a reputable reloading supplier. This was when .357 sig was truly nowhere to be found. I reloaded some of the .357 sig and they were fine, no issues. I want to start reloading 9mm and assumed I would have to sell those bullets as they should have been .357, correct??? I measured them last night and they measure .355. So now I am wondering if I measured wrong or they sold me the wrong thing and I just dodged the proverbial bullet by loading them for .357 sig. I am very cautious and now wondering if I am measuring them correctly at the very bottom edge of the bullet?? I used the same dial caliper I have used for years. Link to comment Share on other sites More sharing options...
MWP Posted March 3, 2015 Share Posted March 3, 2015 357 sig is supposed to eat .355 aka 9mm bullets, you're ok. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted March 3, 2015 Share Posted March 3, 2015 I am very cautious Perfect way to proceed. Cautiously. Drop your powder charge 10%, and re-check your OAL (Plunk Test), and work up cautiously, with a chrono ... Link to comment Share on other sites More sharing options...
chuck s Posted March 3, 2015 Share Posted March 3, 2015 Most guys around here that use xtreme bullets use their .357 147gr bullets. I find them more accurate in my CZ and tanfo Link to comment Share on other sites More sharing options...
racerba Posted March 3, 2015 Share Posted March 3, 2015 (edited) I've loaded up my 9mm using .356 bullets...no issues or problems... .357 sig were supposed to be 9mm inside a necked down .40 case, no? Edited March 3, 2015 by racerba Link to comment Share on other sites More sharing options...
fdbyrne79 Posted March 3, 2015 Share Posted March 3, 2015 They will shoot safely loaded for 9mm. The only concern is how they will feed. Some guns don't feed them as well as traditional 9mm bullets because the nose is less pointed and more round. You'll probably be just fine. Link to comment Share on other sites More sharing options...
alscott Posted March 3, 2015 Author Share Posted March 3, 2015 Thanks so much. Most helpful bunch of folks on any board ever. No unneeded opinions just answer to topic at hand. Thank you. I really like to reload but I must admit it always worries me a bit. I have been doing it for years for .45, .308, .44 mag, 30-06. Mine and my step-son's .308 would probably spit out a factory load. Anytime I run up against any issue I like to ask folks that I believe know. I did just find an article that said it was a .40 case necked down to a .9mm. Guess I could have just googled first. Link to comment Share on other sites More sharing options...
Sarge Posted March 3, 2015 Share Posted March 3, 2015 And .357 mag is a .358 bullet . Montana gold lists 357 dig bullets and they are just 355 9mm bullets Link to comment Share on other sites More sharing options...
aandabooks Posted March 3, 2015 Share Posted March 3, 2015 I load my 9mm/.357sig with .356 coated lead from S&S Casting. My .38 Super gets loaded with .356 jacketed and the .38/.357 get loaded with .358. Link to comment Share on other sites More sharing options...
Steve RA Posted March 3, 2015 Share Posted March 3, 2015 I use .358 130 grain LSWC bullets in my 9mm with no problem. In the stock barrel and now in the Kart barrel. Link to comment Share on other sites More sharing options...
alscott Posted March 4, 2015 Author Share Posted March 4, 2015 I just weight a bullet and it looks like I have nearly 1,000 115 gn 9mm. I was hoping for 124 gn. I think I read on here once that Clays was good for 9mm. Is that the case? I have two pounds of it and I know that's why I bought it. This is for IDPA, steel, etc at the range. I have a lot more powder than I realized. I bought what I could when it was nowhere to be found. 4895, 4350, Power Pistol, Bullseye, 2400 and Titegroup. I bought it last year but didn't have the time nor brass to start the 9mm. Been using Bullseye for .45 but somebody at the range acted like I was nuts for using it. Link to comment Share on other sites More sharing options...
GJGary Posted March 4, 2015 Share Posted March 4, 2015 Bullseye is to old of a powder that has shot more 45 projectiles down range than any other powder so why would you use it. I must be nuts also. Link to comment Share on other sites More sharing options...
dauntedfuture Posted March 4, 2015 Share Posted March 4, 2015 Measure the bullets that you have. I suspect they are .355-.356 and will be fine in a 9mm. Work up your charges as you normally would. Most of the time you can shoot .357 in a 9mm without an issue and you can for sure shoot .355 9mm bullets in a .357, they might just not shoot as well. The issue that you MIGHT have is that bullets designed for the .357 sig (.355 bullet, same as 9mm) might not feed well in a 9mm semi auto. I suggest you buy a new S&W 929 9mm revolver to shoot them, you always need an excuse to buy another pistol. Link to comment Share on other sites More sharing options...
racerba Posted March 4, 2015 Share Posted March 4, 2015 The issue that you MIGHT have is that bullets designed for the .357 sig (.355 bullet, same as 9mm) might not feed well in a 9mm semi auto. just curious...why not? or was that just a reason to get a new gun... Link to comment Share on other sites More sharing options...
fdbyrne79 Posted March 4, 2015 Share Posted March 4, 2015 It's because the bullets, while the same diameter, are shaped differently. There's a noticeable difference if you compare them to most standard 9mm rounds. I'd post pictures of each if I were home. Link to comment Share on other sites More sharing options...
Alan550 Posted March 4, 2015 Share Posted March 4, 2015 The 357 SIG was named because it was (is) the ballistic equivalent to a .357 Magnum round out of a 4" revolver. The bullets are 9mm (.355"), not .357 as one might think seeing the name on the round. Alan~^~ Link to comment Share on other sites More sharing options...
racerba Posted March 4, 2015 Share Posted March 4, 2015 It's because the bullets, while the same diameter, are shaped differently. There's a noticeable difference if you compare them to most standard 9mm rounds. I'd post pictures of each if I were home. Different 9mm bullets are shaped differently also...I didn't know that there was a special .357 SIG bullet profile... Link to comment Share on other sites More sharing options...
alscott Posted March 4, 2015 Author Share Posted March 4, 2015 These are hollow points too. Wish I knew the brand/type. I bought these probably 10 years ago and just never really got into reloading the .357 sig. It was a pain with the necked down cases best I recall. Plus it really wasn't popular then and cases were impossible to find. Haven't had the Sig in that caliber in forever, just hung on to all the dies, cases, and bullets. Link to comment Share on other sites More sharing options...
superdude Posted March 4, 2015 Share Posted March 4, 2015 It's because the bullets, while the same diameter, are shaped differently. There's a noticeable difference if you compare them to most standard 9mm rounds. I'd post pictures of each if I were home. Different 9mm bullets are shaped differently also...I didn't know that there was a special .357 SIG bullet profile... Yes, the SIG bullets have a short wide nose. Link to comment Share on other sites More sharing options...
MAC702 Posted March 5, 2015 Share Posted March 5, 2015 (edited) ....357 sig were supposed to be 9mm inside a necked down .40 case, no? This. Sig called it the ".357" because it just SOUNDS powerful. As mentioned, the component bullets will usually be labeled for the .357 Sig because of the bullet profile. Edited March 5, 2015 by MAC702 Link to comment Share on other sites More sharing options...
NuJudge Posted March 6, 2015 Share Posted March 6, 2015 Let your barrel groove diameter and chamber be your guide. I have no experience with the .357 SIG, but lots with a variety of 9mm pistols. I have mostly Beretta and Walther 9mm barrels, and all of them slug out to just under .358" groove diameter. I shoot mostly Lead bullets, and all but one will load, chamber and fire a .359" bullet. The one will gladly load chamber and fire a .358" bullet. Not every 9mm barrel will chamber these big bullets. My father gave me his 9mm Browning HiPower some years ago, and it will not chamber a cartridge loaded with a bullet over .356". It has a groove diameter bigger than that. It gets jacketed only. Link to comment Share on other sites More sharing options...
rdinga Posted March 7, 2015 Share Posted March 7, 2015 Interesting topic that I keep reading about-the trend and my limited experience show the Zero .356 124 JHP is preferred by a lot of guns and shooters vs the .355 equivalent. I was having personal conversation with a friend that has worked for Glock for double digit years and he agreed the .356 was the way to go...and he showed me pallets of Zero Ammunition for the Glock team. Nothing wrong with a diameter larger than .355...... Link to comment Share on other sites More sharing options...
dauntedfuture Posted March 7, 2015 Share Posted March 7, 2015 I still think you need an excuse to get another gun. You can even give me the bullets so ill have an excuse to buy a 929! Link to comment Share on other sites More sharing options...
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