Why 500g at once? I recommend scaling back.
I don't remember the exact temp, but you should be able to handle the jar with your hands, so a lower heat setting. A little higher tends to be fine as well.
If this is for the acid cook, do so for 8 hours. If it's for the base, cook for 2, stirring occasionally.
And your jar is fine. Just don't clamp it shut during the baths.
Hope this helps.
One love
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Know thyself, nothing in excess, certainty brings insanity- Delphic Maxims
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