I get the excellent results in my White UM with the BullShop .5040 diameter in 450 or 500 grain. I actually like the 500 grain a little better. I usually load 70 grains of Triple Se7en 3f and no wad. The accuracy is outstanding. Like described, the weight of the range rod will normally almost seat the conical. All but the last inch or two. I have to press that into the fowling down there.

Another good shooting load is a .458 orange knight sabot with my home casted 423 gr pure lead flat point. They are said to be a 405 gr flat point but I have never got one to weigh that yet. I was shooting these with 100 grains of powder and the down range thump was outstanding. It shook the plates right out of the steel bullet trap. Hate to think what it would do to a deer.

I also have shot the 200 gr XTP (all sabotloaders fault as I was happy with conicals until he kept rubbing sabots in my face) and like Sabotloader said, they shoot great. Downrange they seem to have a lot of power as well.