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Just had one of these at PHL. I'm in. Any of you fellows still here? Any success?

I did my own for my Unibrau 10-gallon system. And then tweaked it with some experience. The profile development guidance that Brewfather gives is pretty helpful.

I did a stove top small scale test that showed you do not get much down below 0.030". Moderate gravity.

I did just that. The markings did not agree with the markings on three of my other vessels. Off 0.25 gal at around 6. I informed the Mfr - and they said thanks.

Agree. No conclusion was made.

The science of the thing that he did not do?

The OP said that for bigger and different grain bills he observed lower mash efficiency than for brews with smaller different grain bills. And I said that I have observed the opposite. If the OP had said what you are saying - I would not have chimed in at all - as I have no experience in...

Yeah - that's not what either the OP or I am talking about. Seems as though we may be on two different topics.

I record pre-boil volume (at mash temp) and pre-boil gravity (by refractometer of a cooled sample) for each batch. If I am doing it incorrectly, I am doing it consistently incorrectly. The numbers on the side of the kettle are pretty easy to read, though.

The formula works to provide the correct volume to produce either a 5 gallon or 6 gallon batch for any size grain bill (up to capacity) - for a 60 minute boil. Screenshot 2020-12-02 110102 by John O'Neil, on Flickr

With my system - i calculate my strike volume based on the total grain bill. My last brew was my biggest grain bill ever (still not huge) but my mash efficiency was also my highest to date - at 84ish IIRC. I had been running in the 78 range for lower ABV brew.

Wow.

Curious as to why one would not just do 1 gallon batches on their stove top.

Ditto.

I have three active hobbies at the moment: Cycling - My road bike is stupid expensive - best carbon available - wireless electronic shifting, etc. My mountain bike cost more than most would spend - but not stupid money. My urban ride is a CX bike that was wayyyy overkill. I usually ride...

Is the military discount just for active duty - or does it apply to veterans, too?

The experiment that I would do to verify this hypothesis is: Take one large sample (enough to do two separate hydrometer readings) with much trub in suspension. Let it all settle. Decant a volume of just liquid and measure. Shake up the remainder and measure.

10-4. I had to look Corona Mill up. For those that use a roller mill, the fellows at Brulosophy did two "Mind the Gap" exbeeriments. The first was a HG beer where a crush size of 0.039" yeilded an OG 0.010 lower than the same brew with a crush gap at 0.025". The second was a moderate...

Are you milling your own grains? See my crush size thread for some info on setting your mill gap wrt BIAB mash efficiency.

I have seen some evidence that from .030 down to as close as you can get them results in no increase in efficiency. Have you experienced the opposite?