I tend to do things, shall we be kind and say differently. I try very hard to keep each block square. Then when they are together, I measure the quilt top and find a size that works. By that, I mean average height and width. I cut the borders to that exact measurement and make them fit. . . Maybe a it of easing or stretching. (I am talking 1/4 or 3/8" tops.) from there I sandwich the quilt, cut to size, put the the binding on and then quilt. They do come out square. Well, it works for me.