Wouldn't a full bore conical if lighter in weight, run the risk of not stabilizing well and tumbling? Plus these are meant to be pushed and in some cases hard. So that means a lot of velocity. Now the lighter REAL conicals shoot well in most rifles, but you can not push them too hard or they fly all over the place.

I am guessing that since they were trying to mimic a sabot round with a conical, this was about as low a weight as they dare go. Now if they had a plastic sleeve like the Saber Tooth or the Powerbelts, that could expand for them and then fall off, that would be different.

I personally know very little on bullet design. I am one of them that try the thing. If it works.. great. If not, move on. So far the few FPB's I have shot show a lot of promise.