Bigiron - the one I tested expanded to only about .40 caliber. Also, only the verytip expanded - looked like a little flower on the bullet nose about 1/4" back from where the tip was before expansion. I'm saving these in case I need to make a head shot on an elephant someday
In contrast, my pet .270 Ackley load (130 Swift Scirocco) will expand to about .92" (average) in an elk and still weigh about 115 grains (88%). I'm up to eight consecutive one shot kills. All dropped in thier tracks or were on the ground in under two seconds. When I heard they were changing this bullet design to the Scirocco 2, I bought a lifetime supply of the original ones.