Question on grain spawn

I currently use 5 pound bags of sawdust spawn, but I'm thinking of switching to 3 pound bags.  I'm starting to make my own grain spawn.  How much soaked rye by weight should I use for the 3 pound sawdust bags?  The 5 pounds?

I'll be using mason jars for the grain spawn.  If you know what size mason jars to use, that would also be appreciated.

Wide-mouthed quart mason jars work well in common pressure cookers. And the 24 ounce jars with straight sides all the way work amazing for grain spawn.

Thank you.

But how much should I make to inoculate 5 pound and 3 pound sawdust bags?  I'm thinking it;s easier to use an entire jar of grain spawn per sawdust spawn bag.

Mushroom spawn self-replicates. Any amount of spawn will expand to fill any amount of sawdust. From a practical standpoint, maintaining sterile conditions works easier if one jar of spawn goes into one bag of wood chips.

Yes, but there are recommendations that increase the chances the spawn will grow fast enough to prevent contamination.