I just loaded my first 20 357 SIG rounds this morning and took them to the range to chrono. I've been reloading about a dozen centerfire rifle and a dozen or so centerfire pistol rounds since the early 80's, but this is my first venture with the SIG round. I just never really wanted to tackle it with the short neck, but have recently decided to go for it. My load was 12.5 gr Accurate #9 under a 124 gr Montana Gold RN FMJ bullet and a Wolf small pistol primer. OAL was right at 1.140. I tried 13.0 gr but couldn't get it any lower than 1.155", which drug in my Glock 40 mags. Gun was a G22C with a G31 barrel, not ported. I have had the barrel for years and it probably doesn't have 50 rounds down it. I am ready to start shooting more SIG, so that's why I have decided to reload it. Here's what the chrono said for 10 shots... Hi - 1307 Low - 1267 AVG- 1284 ES - 40 SD - 11 Inspecting the brass after it was shot showed no flattened primers or any signs of over pressure. The primers actually look better than they do on my 40 loads. I didn't have any factory loads to compare it to, brass was once fired Remington. Do those number look like I am on track? Second question. I have about 100 SIG brass, but 2 5 gallon buckets full of 40 SW brass. I have heard of people running 40SW through the SIG dies and making 357 SIG brass. I did that with 5 40's just to see what it did, but they measured a little shorter than the SIG brass. My concern is that since the factory round is already short on neck, will the even shorter neck on the resized 40 brass only cause more problems? Even if I only used them one time and left them laying or picked them up for the recycle bin I wouldn't have a problem with that. Or would I be better off ordering some once fired SIG brass? I see I'm gonna have a LOT of fun with this round!! Thanks for any thoughts.