You MUST wait until the pressure drops completely in your canner. It does no harm to let them sit in there for a while after, either. When I can soups they’ll continue to boil in the jars for an hour or so after I pull them out of the canner. So don’t rush it.
Patience is rewarded in this case.
L
“It does no harm to let them sit in there for a while after, either. When I can soups they’ll continue to boil in the jars for an hour or so after I pull them out of the canner”
That’s a long time to continue to boil!
I just had someone tell me sometimes they leave the jars in the canner overnight. And they are just fine in the morning. That’ll work good with the regular metal lids. I’m thinking I need to buy some more, I do like using the metal lids too.