I found a wonderful Voere rifle made in Austria in caliber 458 Winchester Magnum.
I do not know that twist rifling and he wanted to use it with cast bullets, i saw that load with 500, 550 grains weight.
I found a particular mold but not sure if the weight is excessive.
With these pills you may also enjoys long range?
http://www.ebay.it/itm/458-675-BT-NE...item1e8ff18b20
Of course I could pour more bullets!