I ran with
Homebrew Dad's overbuild calculator.
My 2001 was from late February, so I considered it 55% viable for starter calculations.
I ran with the basic specs:
Pitch rate - 0.75million/ml
Batch Volume - 5.55gal/21L
OG - 1040 OG
Overbuild - 105 billion
Only a single step, 1.5L/164g DME. After 30-ish hours on the stir plate in 1040 wort, the calculated cell count is in the 284 billion range.
I crashed the flask, decanted a bit off the top, then swirled up the rest such that I had 2 pint jars. Since I was only looking for 105 billion cells per pitch and may have potentially gotten in the 140 range, I'll consider that a good "safety margin".
There was a delay between starter creation and brew day, so I needed to crash the whole shebang knowing I'll need to do extra steps to "wake up" the pitch for the BoPils.
Built a vitality starter with one of my pint jars, maybe 900mL. It was a lazy brew day, so it had a full 5 hours to do its thing. First time trying this with a pint of my own yeast, pretty cool!
Brew day came and went. Started the spund @ 12 PSI maybe 8-10 hours after sealing up the corny keg.
FG per the recipe was 1.007. Right now at about 70 hours in, we are at 1.009-1.008, which could be it for this one.
I did a free rise from 18C, it's currently at 21.1C and rising. My inkbird cutoff is 22C, but I wondered if the off-gas now at 12 PSI is just due to the uptick in temp? I am in the "forever bubble" stage, one every 15 seconds due to the 8mm EVA barrier tubing I am using for the blow off.
I will likely call her done tomorrow and cold crash this one. The hydrometer samples were Saaz'y spicy!