although the '57 isn't the snare mic of my choice is certainly is usable. I use a schoeps small diapragm condensor generally. Use the polar pattern to put the hi-hat in the rejecting portion its pick up pattern. Also I come in with the mic pointing straight down at the snare to help reject the rest of the kit even more. I mean straight down. however you gotta watch putting too much of the ass end in direction of the hi-hat or you start picking up the kick. Also people forget there are lots of loading issues with dynamic mics and preamps. Half the time you are getting shitty sound because your load is incorrect. Dynamics are very sensitive to proper loading and if you have preamps which can select different impedances you will hear a drastic shift in the sound quality with different selections. A lot of great engineers don't like 57's for nothing. It is user error my friend. I mic the top and bottom of the snare and blend to taste. Mic parallel to the snare wires not perpendicular. Also you will have to invert the polarity of the bottom mic in reference to the top mic. word.