There is really no such thing as a minimum weight. Maturity comes into play as well. If you breed your 6 month old male at 500g, he may breed, but sperm potency (lack thereof), may lead to infertile eggs.
Your males must be mature enough to breed successfully. I like my males 9 months old and 900g. This seems to be successful for me personally. Out of 250+ eggs this season I've only had 1 infertile egg and zero slugs.
I have bred males at 450g-500g and 5-6 months old, but the success rate of a viable clutch is much lower.
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