Originally Posted by dumsboa09
Pre boil gravity was 1.040. I was trying to hit 1.070 but only hit 1.061.
I think your pre-boil gravity might be more of an issue here than any boil-overs; going from 1.040 to 1.070 is nearly doubling the sugar concentration -- which means boiling off almost half the water.
Unless you're intentionally doing something weird, you're not going to be boiling off more than 20% or so of your pre-boil water, so, you should be looking for pre-boil gravity that's under the post-boil target by 20% or less. A 1.040 pre-boil probably won't break 1.048 when all is said and done (you must've boiled off about 2 gallons to hit 1.061, which is a lot), and you'd want to start around 1.056 pre-boil to hit 1.070 post.