https://www.grafs.com/product/188177 1 lb of Hodgdon T7 FFg 19.99 7000 grains powder = ~100 loads at 100 grains Volumetric 20 cents per load.
https://www.grafs.com/product/185058 1000 Cheddite 209 primers 27.59 2.8 cents per load
https://www.grafs.com/product/189133 Hornady .452 XTP 50/box 14.39 29 cents per load
https://www.grafs.com/product/188040 Harvester .50 sabots 50/pack 4.59 9.2 cents per load
Cost of above load
61 cents
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https://www.grafs.com/product/185256 or
https://www.grafs.com/product/185257 245 grain Powerbelts 15-20 @ 16.99 85 to 114 cents/load
https://www.grafs.com/product/200733 TC Shockwave 250 grain 14.99/15pk 100 cents per load
https://www.grafs.com/product/188181 Hodgdon T7 50-50-100 pellets 22.99/box 46 cents per load
same primers as above 2.8 cents per load
Cost of each load using above components
$1.34 to $1.63 per shot
All based upon just one vendor's pricing and does not include HAZMAT or any shipping charges (should be roughly the same expense for either load).