300RUM build options

Thanks for the info. I want to try N570 but wasn't sure where to start. I was thinking 87-88 grains.
Look at their different loads of N570 for the two different 200 grain bullets; one is 88 to 98 grains and the other is 83 to 92 grains. Either way when you run your pressure ladder you can use full grain increments to find the top end.
 
Building another RUM as we speak and I went with a Defiance Rebel Sheep Port, Wyatts MBE3 kit, Hawkins M5 Oberndorf, TT Special, McMillan Game Warden Adjustable, Proof 26" 1-10. Have another setup on a Defiance Deviant Hunter, Bartlien 3B with McMillan Thumbhole. The only issue with the Deviant is trying to get enough eye relief on long scopes with the intergal rail. I could not get my ATACR to work hence building new off the Rebel action. Here's my action build sheet for reference.
Screenshot_20200304-122006_Write on PDF.jpg
 
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