AG with a 4 gallon boil but a 5 gallon batch size

[Revvy]

do you have to up your grain bill any or just your hop bill?

Only the hop bill. I've never come into a situation of doing this where I've changed the grain bill to accomodate any of the "efficiency issues" that people "swear" (usually those who have never tried it) that will occur.

Now having said that I build my recipes with beersmith, with a set efficiency in the software settings based on my system... so POSSIBLY the software is calculating that for me, but like I said I've never seen changes that warranted it.

I mean, that if I grab any other recipe of mine, and brew it, I'm STILL hitting all the requisite numbers in terms of gravity.

So in my opinion, any of these supposed issues of changing the grain bill may be so miniscule that I've NEVER had any issues, or had to use more grain to make a beer this way.

YMMV though *Shrug*

(And with all respect to my brother brewer Wilser, who where this is concerned, is prolly the only time we've disagreed on something.)

 

[wilserbrewer]

Thanks Revvy,
Please notice I used the word "typically" and I consider your brewing skill far superior to typical

I would expect a higher gravity with a 5 gallon mash and sparge compared to a 2.5 gallon mash and sparge with a 2,5 gallon water top up, with the same recipe....

If you hit your intended result or close that's all that really matters. Cheers buddy