My first deer kill with a pistol was with a 357 mag. Colt Trooper. It only took one shot in the chest at 35 yards. He dropped in his track and didn't move. So yes, the 357 is a good deer round if used at appropriated distances and you place the shot well. I would say anything within 75 yards would be a good kill range. Other will stretch that distance and that's alright. I feel more comfortable at the 75 yard range with a 357 mag..
All that being said, I did eventually switch to the S/W 629 and then to the T/C Contender in 44 Mag. The reason, more knockdown power and longer range.