You wont find many 452s or even 458s with a good BC even upto 400gr. Parkers 325gr MH is about the best available but the velocity needed for expansion will limit its effective ML hunting range.

Its cost will limit its usefulness for target shooting. $2 a pop will get expensive fast.

Hawks bullets offers some custom bullets a bit cheaper than Parker or Rocky Mountain bullets. RMB makes the bullets for Parker. Hawks ML bullets in the past had some quality control issues with the points. Not very uniform for precision shooting IMO.

Speer offers a dandy .458 350gr but its BC isnt that great. If you knew someone with the equipment to reshape the ogive, you might be in business. Barnes has a .458 400gr Original Semi Spitzer which might be worth trying but its still a $1 a pop and has a very thick jacket.