Crush the berries with a potato masher. Add the crushed berries to a large, heavy bottomed stock pot.
Dump the package of pectin into a small bowl. Draw out 1/4 cup sugar from your pre-measured 4 cups of sugar and stir in in with your pectin. Add this mixture to your crushed berries and stir to combine. (You can optionally add 1 teaspoon of butter here to help reduce foaming later on).
Slice your vanilla beans open from top to bottom and scrape out the seeds; add this to your berry mixture and then throw in the empty pods as well.
Bring this entire mixture to a boil; remove the vanilla bean pods.
Quickly stir in the remaining sugar and bring to a full rolling boil. Boil hard for 1 minute and remove from heat. Skim foam from the top.
Ladle hot jam into hot jars, leaving 1/4" headspace. Place prepared lids & bands; once all jars are filled, put them into your boiling water canner. Lower the rack into the boiling water, cover with lid, and process for 10 minutes.
Remove from your canner to cool for 24 hours. Be sure all lids have properly sealed, then remove bands and store in a cool, dry, dark location.