Need help with 300RUM Berger 230gr hybrid target and US 896 powder

[NCMTNBOY]

So, I have looked for components for my 300 RUM for 5 months. This is what I have. Yes, I know H-1000 is a better option(feel free to ship me some). I understand US896 has temperature sensitivity, but its what I have (2 lbs from midsouth). What I would like is some real world data, or thoughts as to where I should start and theoretical max. I will be shooting it from a stock sendero ( with a wyatt box) with RP brass and will be using the Berger 230gr hybrid target bullets. Thanks in advance.