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Campden tablets and K-meta are the same thing, either K-meta or Na meta can be Campden. I would notven think of useing campden for a big batch like this though as the tablets are much more expensive then the powder and the powder is much easier to use. 300 lbs of grapes will yield you approx 30 gallons of wine unless you are doung second run wines which will give you more but lesser quality. typical dosage is 1/4 tsp of k-meta per gallon so you would use approximately 7 tsps of k-meta for this batch but do check with the guy. I would not ferent these using natural yeast myself and sulfite to let my yeast of chois=ce do its thing. Where are you getting these grapes and what kind of grapes are these as that could change your wine yield.