Any one use Nosler 300 gr custom competion or 300 gr accubonds in 338-378 ?

[dgr416]

I am getting the long range itch for 300 gr bullets in my 338-378 .I have only used 300 gr Serria match kings in it but not much .I.have some wc867 powder and a little r25 to load with .Which one if these bullets have you used and what load did you use abd how good where they on big game ?