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Colt shot across S&W's bow when they came out with their .357 during WWII.158 grain slugs are the weight the factories use to regulate the sights on non-adjustable revolvers in 38 or 357. My plinking load is a 148 DEWC in a 38 case sitting on top of 4.0 grains of 231 and any standard primer. Clean your cylinders well and the carbon and lead residue will not hamper 357 length loadings. Hot 38/44 level loads shot in 38 cases will over time erode the front of the cyylinder, and spoil 357 accuracy. 38/44s are not loaded commercially anymore, they are 24-25OOO psi pressure levels that typically drive a bullet from a heavy frame 38 at 1000-1100fps. This was common before WW2. After WW2 357s became plentiful and the 38/44 load was relegated to history. SAAMI spec for modern 38+P loads is 20K. I don't shoot any 38s with anything hotter than +P.
Before then, it was all S&W's game.
The Colt gun eventually became the Trooper Mk.IV.
Dean