Hi VMDrummer,
I too have a metal shell snare ( 1970's Premier Olympic, 14x6)
I have tried several batter heads and have found the one that delivers the sound I like is a
Remo Coated Weatherking Pinstripe. I also have a
Remo clear pinstripe reso,20 strand
Pearl snare wires. I also use two squares of Moongel on the batter.
Other things to consider: how the drum is tuned, how much tension on the snare wires,type of stick used ( wood or nylon tip) and the actual stick power you use.
These are the main factors that affect snare sound,things like room temperature and the snare stand also play a part.
I would say that tuning is paramount.
Good luck.