If a cut off saw can make angle cuts on 2 different planes (horizontal and vertical) it is referred to as a compound mitre saw, then you can get ones that slide for wider cuts, (sliding compound saw). A sliding coumpound in a larger size will normally have a wider angle range. I like my 305mm sliding saw but it's big heavy and a pain to carry for the work I normally do, but it's great if you are setting up for a few days doing skirting, arcs, flooring, framing etc