Photos!! We need photos! Of your sawing setup.
I assume you are talking about cutting the cartridge cases, which sound like they are aluminum...not actually the bullets, which probably are not cased in aluminum?
It sounds like you are cutting the cartridges apart to separate the two alloys of aluminum? Which way are you cutting the case? I'm guessing in half the "hard" way?
You need at least two teeth in the cut to avoid vibration and damage to the teeth. To keep the aluminum from sticking to the blade, you need to run a coolant...if I'm not mistaken you can use something like varsol.
If you are using a vertical bandsaw, is designed as a wood cutting bandsaw or a metal cutting saw? The actual band speed is important for what you are cutting.
A few photos might help us make a few more detailed suggestions.
Jon.
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