Has anyone tried 869 in their 300 RUM? I've tried retumbo in mine and was not super impressed with velocities. I think I'm right around 2900 with a max charge for my rifle being around 92 grains. I'm shooting a Remington Sendero SFII. I am shooting Berger 210 gr hunters. Any advice on this powder or others for this application would be welcomed and gladly received.