300 Whisper is going to be a longer range shooter than the 357 Max, but everything is relative when it comes to which is better or more efficient or more effective, etc. A couple of us on here also are in Illinois and have fought the same decision. I settled on the .30 Bellm, some folks like the 300 Whisper better, personal preference for the most part, they're very close in ballistics. 357 Max used to be hard to find brass to start with and had to be hand loaded, now you've got brass available (Midway box of 100 for about $12) and "factory" ammo available from CNC and CPC. Someplace has to sell it as a factory loaded round with at least 500 ftlbs of energy, that's the other qualifier in Illinois. Of the two rounds you mention, I'd take the 300 whisper in a 12-14" barrel, only the 150gr JHP is available from Cor-Bon right now, but I prefer the 125 BT or 130 SSPB. You'll get around 2100-2300fps, nice flat shooter with plenty of energy out to 200+ yards. Mad Max is better if you're only going to have shorter shots, bigger bullet going a little slower, same energy at muzzle that the 300 whisper has at 150-200 yards. Soooo, you need both :grin:
Bill