For a .357Mag to reach full potential - how long a barrel?

not happening. 500 ft lbs, yes, 600, no. Not with standard factory loads, and certainly not with anything that is even remotely like fast enough for combat repeat hits.
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That totally depends or your definition of fast enough and the shooters skill level.
 
not happening. 500 ft lbs, yes, 600, no. Not with standard factory loads, and certainly not with anything that is even remotely like fast enough for combat repeat hits.
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Guess you never seen anyone shoot full load magnums in a bowlin pin match. That can indeed get fast hits, as fast as it takes to move from one pin to another, pins being 16 inches a part.
 
Chrongraphed AVERAGE of 723 ft-lbs in my .357 Magnum, 10-shot average.

That's a 158 grain Zero JSP pushed to 1,436 FPS average. (1,487 FPS peak)
 
I have many 357 magnums. my 3 favroits are my Coonan Classic, My Marlin 1894 trapper and my S&W 640.

Bullet speed varied alot in a 357 magnum based on the barrel.

As far as where barrel starts to slow down a bullet rather than speed it up? I would guess its some where between 16 and 20 inches because my 16 inch trapper shoots faster than my oldest sons 20 inch marlin and my 16 inch marlin shoots quite a bit faster than my 6 inch Coonan hunter barrel.
 
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