I tested Blazers for the pro shop I was shooting for when they first came out. They did great with everything, up until I got to 125 gn non-vented 2-blade heads that measured 1 1/2" across. They wouldn't stabilize those for nothing.

Vented blade heads up to 125 gns and 1 1/4", no sweat. Excellent results. And I'm a diehard feathers guy, too.