@DWright No, it's not really about most commonly used dimensions. Coder will use Bootstrap 4, so dimensions and responsive is not a point here.
@jer I've made same template for my own, 1140px with 12 cols (30px gutter) - Bootstrap default. But let me explain what the problem is.
I'm using this document setup
And when I export slices (slice1.png and slice1@2x.png) and load them into my "page", slice1@1x is blurred but dimensions are OK. When I will use slice@2x, it's ok, but I have to zoom out to 50% in browser to get sufficient result. Check screens:
@1x blurry, dimensions OK.
@2x no blurry, but wrong dimensions - have to designing in 200% (twice bigger) zoom and in browser zoom out to 50% (twice smaller).
It is really frustrating, because I send my designs to client.