Welcome aboard, CGT80! Always nice to see new people joining the forum and the discussions...
Addressing one of the OP's questions, I've used both Starline and Hornady brass in my 500. The 460 would seem to give a similar result to the following although the pressures may not be as great..
With Hornady, I use both their brass and nickle plated cases, mainly to keep my ammo clearly segregated based on warm to extra warm powder charges.
I've found Starline brass lasts longer than Hornady, for me, and is a bit cheaper when purchased directly from Starline. I've had Hornady Brass begin to split in as few as 2 rounds when fired with the hottest charges. Not often but it can be annoying as well as expensive. From my experience, the case life of both products has been between 10 and 14 re-loadings, if they are belled very lightly after resizing the case...
Addressing one of the OP's questions, I've used both Starline and Hornady brass in my 500. The 460 would seem to give a similar result to the following although the pressures may not be as great..
With Hornady, I use both their brass and nickle plated cases, mainly to keep my ammo clearly segregated based on warm to extra warm powder charges.
I've found Starline brass lasts longer than Hornady, for me, and is a bit cheaper when purchased directly from Starline. I've had Hornady Brass begin to split in as few as 2 rounds when fired with the hottest charges. Not often but it can be annoying as well as expensive. From my experience, the case life of both products has been between 10 and 14 re-loadings, if they are belled very lightly after resizing the case...