I put 5# of leaf lard through the meat grinder, and put it in the slow cooker to render. Then I scooped the melted fat out, and through a fine sieve, into clean hot pint jars, and put 2 piece lids on them. 4 of the 6 have "pinged", and I'm hoping the others will too. Not really canning, as they haven't gone through the canner. I keep the jars in the freezer, even if the lids went down, though I know of at least one person who keeps them in a cool pantry. I'm planning to leave one on the shelf this time around, as an experiment.
(The solid bits from the rendering are back in the slow cooker, on HI, to crisp up, and give off the last of their lard. The chooks will like the crispy bits - and so do I, sprinkled over a salad, like bacon bits)