aplthird Posted March 5, 2023 Share Posted March 5, 2023 I have been looking but can find any info so I will try my luck here. I want to shoot full power loads out of my Sig P320. I know Underwood makes hot 357 sig ammo. Is there a way to come close to those power levels, but safely. I plan to load normal loads but I am looking for hotter loads. Thanks. Link to comment Share on other sites More sharing options...
Alaskapopo Posted March 5, 2023 Share Posted March 5, 2023 You can do better with a 9mm loaded major. A 357 Sig is a waste of time. Link to comment Share on other sites More sharing options...
aplthird Posted March 5, 2023 Author Share Posted March 5, 2023 Pretty sure I cannot shot 9mm out of a 357sig barrel. Thanks for your help Link to comment Share on other sites More sharing options...
anachronism Posted March 6, 2023 Share Posted March 6, 2023 What manuals have you checked so far? The real performers in 357 SIG tend to be AA #7 & #9. Stay away from plated bullets since most of them are only good to around 1100 fps or so. I use RMR, and tend to load heavier bullets. Many 9mm bullets can't handle the extra velocities and are not recommended for use by their manufacturers. Most notable in this class is Hornady 124 gr XTP. Most ammo and bullet manufacturers download .357 to keep their bullets in the velocity ranges they were designed to perform best at, and this is the main reason you can't find much for hot loads listed. Underwood 357 ammo seems at its hottest when loaded with lighter weight solid bullets if that's any indication of the situation for you. Link to comment Share on other sites More sharing options...
Alaskapopo Posted March 6, 2023 Share Posted March 6, 2023 3 hours ago, aplthird said: Pretty sure I cannot shot 9mm out of a 357sig barrel. Thanks for your help Yep but you can get a drop in 9mm barrel or a 9mm p320 Link to comment Share on other sites More sharing options...
Alaskapopo Posted March 6, 2023 Share Posted March 6, 2023 Just now, Alaskapopo said: Yep but you can get a drop in 9mm barrel or a 9mm p320 Also you actually can shoot 9mm in a 357 sig barrel. The brass will bulge badly but the gun will cycle. Had a friend of mine make that mistake with no harm to him or the gun. Link to comment Share on other sites More sharing options...
9x45 Posted March 10, 2023 Share Posted March 10, 2023 I loaded a 125 gr Montana Gold JHP on top of 8.2 grs of BE-86 to about 1,420 fps for Major 9 in Limited. But a 40S&W is far softer while still making Majjor. Link to comment Share on other sites More sharing options...
anachronism Posted March 16, 2023 Share Posted March 16, 2023 On 3/5/2023 at 7:44 PM, Alaskapopo said: Yep but you can get a drop in 9mm barrel or a 9mm p320 You do understand that 357/.40 slides are different from the 9mm, don't you? Link to comment Share on other sites More sharing options...
aplthird Posted March 16, 2023 Author Share Posted March 16, 2023 You can do better with a 9mm loaded major. A 357 Sig is a waste of time. " Not very helpful at all. Think I will be going with a 125 grain over 12-13 grains Of Accurate #9 Link to comment Share on other sites More sharing options...
OnePivot Posted March 21, 2023 Share Posted March 21, 2023 (edited) Longshot does about 1400 with 9 grains. Seems to make a bit more speed than #9, with significantly less powder. All 357 SIG guns can shoot 1400 fps 124gr ammo. Not many 9's will shoot major out of the box, or even have magazines appropriate to load it in. Edited March 21, 2023 by OnePivot Link to comment Share on other sites More sharing options...
PhotoRecon Posted March 21, 2023 Share Posted March 21, 2023 Local law enforcement uses 357 Sig and experienced bullet set back with some loads. They use AA #9 in reloads to help with that issue. This is Western Powders load data for the 357 Sig. Link to comment Share on other sites More sharing options...
aplthird Posted March 21, 2023 Author Share Posted March 21, 2023 37 minutes ago, PhotoRecon said: Local law enforcement uses 357 Sig and experienced bullet set back with some loads. They use AA #9 in reloads to help with that issue. This is Western Powders load data for the 357 Sig. YES this is the data I am using Link to comment Share on other sites More sharing options...
PhotoRecon Posted March 21, 2023 Share Posted March 21, 2023 Cool, then it looks like your on it... We're using a PF of 165 for major so 125 over 1320 fps gets it done...IMHO that is a potent load... Link to comment Share on other sites More sharing options...
Alaskapopo Posted March 28, 2023 Share Posted March 28, 2023 On 3/15/2023 at 6:00 PM, anachronism said: You do understand that 357/.40 slides are different from the 9mm, don't you? You do understand 9mm conversion barrels are made for 40 and 357 Sig slides they are over sized. I have a 9mm Barsto conversion barrel for my Sig 229 in 40 sw. Do some research Link to comment Share on other sites More sharing options...
K-Tex Posted March 30, 2023 Share Posted March 30, 2023 On 3/5/2023 at 7:45 PM, Alaskapopo said: Also you actually can shoot 9mm in a 357 sig barrel. The brass will bulge badly but the gun will cycle. Had a friend of mine make that mistake with no harm to him or the gun. You're corect in a manner of speaking. 9mm is the caliber for the 357sig, but 9luger is a different story. This was my mishap as I loaded a 357sig round into a 40s&w. I bounced down the barrel at hit the target at 50 yards. Now I have 1 fireformed 40s&w case. Link to comment Share on other sites More sharing options...
K-Tex Posted March 30, 2023 Share Posted March 30, 2023 I load for 357sig and love that cartridge! From 90-147grs and various powders for each. Give me a bullet weight choice and I'll see what info I have. Link to comment Share on other sites More sharing options...
aplthird Posted March 30, 2023 Author Share Posted March 30, 2023 1 hour ago, K-Tex said: I load for 357sig and love that cartridge! From 90-147grs and various powders for each. Give me a bullet weight choice and I'll see what info I have. I am using 124 grain 9mm- 124 FP extreme copper plated bullets. I am looking to shot good power levels out of it. My powder is Accurate #9 They say to start at 12 and go to 13 grains. Although I do have other powders. I am looking to shoot at major power level. Link to comment Share on other sites More sharing options...
K-Tex Posted March 31, 2023 Share Posted March 31, 2023 12 hours ago, aplthird said: I am using 124 grain 9mm- 124 FP extreme copper plated bullets. I am looking to shot good power levels out of it. My powder is Accurate #9 They say to start at 12 and go to 13 grains. Although I do have other powders. I am looking to shoot at major power level. I don't do any comp shooting, so I'm not sure how that's figured? Link to comment Share on other sites More sharing options...
aplthird Posted March 31, 2023 Author Share Posted March 31, 2023 8 hours ago, K-Tex said: I don't do any comp shooting, so I'm not sure how that's figured? No worries if you dont mind me asking what are the loads you are using? Link to comment Share on other sites More sharing options...
K-Tex Posted March 31, 2023 Share Posted March 31, 2023 I use Sierra and Hornady mostly form 90-147gr. As far as powders for each I'd need to check. Pretty much everything I load is near max. Those 90gr sure do fly from a 357sig. I'll get back to you on powders per bullet combos I've done. Link to comment Share on other sites More sharing options...
K-Tex Posted March 31, 2023 Share Posted March 31, 2023 On 3/21/2023 at 7:35 AM, PhotoRecon said: Local law enforcement uses 357 Sig and experienced bullet set back with some loads. They use AA #9 in reloads to help with that issue. This is Western Powders load data for the 357 Sig. that cartridge is a pita, but love the power from it! I use the Lee FCD with the right amount of depth on crimp without any issues of bullet set back. With such a short neck it's worth the money for security. Link to comment Share on other sites More sharing options...
Alaskapopo Posted April 7, 2023 Share Posted April 7, 2023 On 3/30/2023 at 8:27 AM, K-Tex said: You're corect in a manner of speaking. 9mm is the caliber for the 357sig, but 9luger is a different story. This was my mishap as I loaded a 357sig round into a 40s&w. I bounced down the barrel at hit the target at 50 yards. Now I have 1 fireformed 40s&w case. I have seen it done with 9mm Luger in a 357 Sig for an entire mag and the rounds grouped well. Brass was ruined though Link to comment Share on other sites More sharing options...
K-Tex Posted April 8, 2023 Share Posted April 8, 2023 On 4/7/2023 at 9:50 AM, Alaskapopo said: I have seen it done with 9mm Luger in a 357 Sig for an entire mag and the rounds grouped well. Brass was ruined though What firearm was that done in? Out of curiosity I might chamber 1 (not fire it). Link to comment Share on other sites More sharing options...
anachronism Posted April 17, 2023 Share Posted April 17, 2023 On 3/28/2023 at 12:31 AM, Alaskapopo said: You do understand 9mm conversion barrels are made for 40 and 357 Sig slides they are over sized. I have a 9mm Barsto conversion barrel for my Sig 229 in 40 sw. Do some research I've never had the desire to neuter my 357 to 9mm, so such aftermarket conversions mean little to me. The OP was asking for upper end loading data for 357 SIG and you expect him to buy a new barrel in a lesser caliber to suit your idea of what he needs instead of giving him what he's asking for. I'm not even going to address your suggestion of shooting 9mm through a 357 barrel. Link to comment Share on other sites More sharing options...
aplthird Posted April 17, 2023 Author Share Posted April 17, 2023 Thanks for all the help. I went to the range in my 357 Sig with 125 grain plated extreme bullets. I started at 12 and went to 12.7 grains Accurate #9. Made decent powder. In my 10mm I loaded a coated 155 grain over 15 grains Accurate #9. This load I really like. Thing is these recipes eat up powder. I was considering BE-86 because of lesser powder use. What are peoples thoughts I have looked around but the load data seems to be less available with the 86 or should I stay with #9? Thanks. Link to comment Share on other sites More sharing options...
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