I've been brewing all-grain for about five years now, after brewing with extracts for fourteen years. When I went all-grain, I traded a corny keg with a buddy for a Corona grain mill. I've used this mill all this time and have made good beers with it, even a few competition winners.
Generally I set my efficiency on BeerSmith at 75% overall, and I usually realize an actual yield of somewhere between 70-80%. I'm pretty okay with that, though I would like to be dialed-in to a smaller range. Also, I've recently built a bar in my basement, so with the additional homebrew that's flowing, I've gone to brewing double batches (ten gallons). This change in production, coupled with the fluctuations in efficiency have led me to invest in a new grain mill.
I've been lurking the forums for months and reading about the mills, and of course all the wonderful knowledge and wisdom shared herein and decided on a JSP Maltmill, Model P without the adjustable rollers. The reason I went with the non-adjustable model is that I want to limit all the variables, including my own fumbling fingers. I don't care if I improve my efficiency over the seventy-five percent I had, I just want to anticipate it more accurately.
So, to my question: what kind of efficiency can I expect from my mill? Can I tighten the range a bit over my old Corona?
Thanks in advance for the advice!