Hi I'm new to this. I bought a 338-378 a couple years ago. It came with 6 boxes of nosler custom rounds with 225 gr accubonds 3253fps. Nosler doesn't do the custom rounds anymore and can't give me any info. And they shoot very well with my gun. I took a round apart and it appeared to have imr 7828 powder 110gr. Looking at threads I haven't seen many people running this powder and not nearly that much powder with it either. If anyone has some load recommendations I would like to give it a try. I do wanna stay with the 225gr accubonds. I'm shooting a 338-378 accumark rc. I believe 1-10 twist. Thanks