Do you screw the lids down real tight before boiling? Do you boil lids and jars first.
Its hard to beat canned peaches and pears.
We just washed the jars and lids before filling and cooking. As the lids go....we just tighten them up "finger" tight before cooking and re-check after they come out of the cooker.
My mom canned everything. AS Ted mentioned, finger tight on the rings when you put the flats on. The flats should have a little dimple in the middle that is "up" before you cook them. The dimple should be "down" (vacuum sealed) when you take them out of the cooker. The flat should make a little snap or pop sound when you open the jar due to the dimple popping back up. IF the dimple is up, or, no "snap" when you open the jar, either it did not seal, or, it started to spoil. It gets pitched. With a good "snap", cook on...
