Personally I do not believe hardness or softness has anything to do with leading. Any hardness if not properly sized is going to lead. A properly sized bullet-regardless of hardness has much less propensity for leading. I can shoot about any lead up to 1800 fps without a GC with no leading. Anything over 1600-1800 I use a GC.
The biggest mistake that causes leading is when shooters mix cast and jacketed in the same bullet.
All this is assuming the use of a properly applied lube. Tom.
