Just noticed some new copper and brass .452" solids from Lehigh Defense...in fact, the 245 gr. brass one is listed for the "458" Bushmaster (Midway typo)...we should try these out, with the possible exception of the 135 gr., which seem a bit iffy to me in the 450b, at least on paper...there's actually another one at 120 gr. which doesn't seem likely to work, but who knows?
https://www.midwayusa.com/product/95281 ... -box-of-50
https://www.midwayusa.com/product/17436 ... -box-of-50
https://www.midwayusa.com/product/33698 ... -box-of-50
https://www.midwayusa.com/product/51009 ... -box-of-50
$34 - $46 per box of 50