Howdy All I am just getting my feet wet on this forum and am interested in exchanging a bit of reloading data for the 357 SIG cartridge. I've been reloading my entire adult life, mostly pistol cartridges including 45 Colt, 45 ACP, 44 Mag, 10 MM, 40 S&W, 357 Mag, 357 SIG, and 9MM Luger. The biggest challenge to date remains the 357 SIG because of the availability of appropriate bullets for this bottlenecked-cartridge. Though the 0.3555" dia 9MM bullets are suggested in every reloading manual I've got, not all of the bullets made for the 9MM Parabellum fit appropriately, in my personal experience. For instance, I have found that the Hornady 115 gr FMJ XTP which I favor for my P99 must seat too deeply to get the COL to reloading specs. The bullet setback issues become too great a concern to me when it takes so little force to push the bullet back into the cartridge. I can get good crimp on the bullet but it must be crimped far enough back that the COL is too great for the round to fit into the magazine. This I would think of as an incorrect selection of bullet for the 357 SIG cartridge. Just a few things like this. I hope there are some reloaders on the forum who will enlighten me with some of their knowledge and experiences in reloading this mini-howitzer of a round. In recent months, I've been intouch with a few bullet manufacturers who feel that the 0.356" dia 38 Super bullets may be a viable resource in the 357 SIG ballistic evolution. I'm especially interested in a possible 130 gr JHP at or around 1400 fps. The M357A-1 is the perfect medium for this trial. I feel the reloading data available is only the tip of the icebergh for what may soon come to light. I'm hoping the cartridge is everything I feel it to be in my guts. I've noticed that there are a few Law Enforcement Agencies that are currently outfitting their people with P226 Sigs chambered in the 357 SIG. Not one of my personal favorite handguns but all in all, a very fine firearm. Makes me wonder, "what do they know that I don't?". Thanx in advance and hava great weekend.