rox17
mountainquilter
that was the size i used because i wanted to test-drive. it did give a wider sashing, but it made it easier to turn under a little more allowance .
it can be done with any size templates, as long as you use templates with corner to corner lines. i would try with 1" but not less, because you need to turn under your 1/4", and why make it harder? n my case, i turned under more.