7mm mag powder choice

wish I had google fu'ed this thread before now. I just tried 568 with 160 Nosler from 68.2-70 grs. I ended up with 2720 as my highest average. That was from a 22" barrel. I would like to end up around 2900'ish or more. I was going by gordon's reloading tool. However, adjusting after this weekends learning I think I'd need to be closer to 73 grs to hit 2900. I get the same velocity with about .7 grs less of Retumbo.
 
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