Redpep
I take it you are using the 454 casull
I am - and also the the 250 Gold Dot for deer - there are a lot of peopleusing these now... CG even uses the 300 grain from his rock sparker... The Gold Dot is a 'poorman's' Nosler Partition.
That .458 Special Purpose bullet that Cayugad found (built for a Marlin 45/70) is a Uni-Cor ( bonded ) bullet and it would be an excellent bullet even for big biggame. I do not know how Dave found this bullet but it was a very good discovery and from his tests - it shoots very well + plus it is a rifle bullet builf for hunting... and I do not know about you but any time I hear 45/70 I am thinking Buffalo stopper even though I know they used a heavier slug...