340mag you always crack me up.
rackmaster, if a number (350) is something you are hoping to end up with (in addition to a great hunt), you'll have to add some numbers in your head when looking at the antlers..
Don't worry about any shapes, "boxy" etc.. that plays no role in the score of the bull. Look for length of tines and the beam. Mass and spread are secondary.. To get to 350, the average length of tines should be pretty good. If you have some stunted brow tines of 12" or so.. you'll have to have some really good length up top to make up for it. And vice versa.. all elk racks vary. If you have 10" 3rd tines.. you'll have to have really long stuff elsewhere to make up for it. Good rule of thumb is 15" avg on tine length will end up with something in that range of bull.
A 320 bull usually looks a whole lot bigger than something in the 300 range. 350 is a whole different league that 320. It won't look small, and in most cases, no real need to add numbers, just shoot. If you're looking at a nice 6 point, but you are unsure, just start doing some math. If you're in a difficult to draw area with bulls around that are in that near 400 range, I'd do a lot of practicing and evaluating bulls in the 320-340 range and convincue yourself to pass... which will be tough as those are some terrific looking bulls. Take your time.
Good luck.
