I brewed an Oatmeal Stout last week and somehow it went into the primary at 1.065 or 16 brix. This was the first time using a refractometer. The receipe was supposed to be a lot lower OG.
Now the refractomer is reading 11 brix and as a backup, I also checked with my hydrometer and it reads the same (1.030). There is no activity in the airlock and has not been in several days.
One calculation I did online said that the abv was 4.7. My question is do I need to get it lower than 1.030?
I’m sure the yeast was the problem as it was harvested several months ago and my starter was done a couple of weeks before I brewed. Thanks in advance