That would be an interesting rechamber, but I don't think it would help with the long throat condition that the NEF 357 barrel suffers from. One could make up a 357/445 SM and end up with something very like.... well the 357 Herret. If I had it to do over again, that is probably where I would start. I've put a lot of thought into this, I'm leaving my 357 Max as is and am going to take my Christmas money and find myself a 35 Remington, a 356 AE Winchester, a 358 Win bolt or lever gun or a 35 Whelen. I'm too heavily invested in 358 molds to walk away from the caliber, so I'm going to find something in the caliber in another rifle. Don't know if that will solve anything, but it's the approach I'm takin'. Overall, I really like the 357 Max, it is a great carbine/rifle cartridge, easy to load for and feed, just mine won't shoot to the standard I want to hold with cast bullets.