7mm Rem Mag--Where would you start???

So I went out and tried RL22 like a lot of guys suggested but could not get sub moa, so next I tried IMR 7828 just because I have a lot of it. I found a sweet spot at 72.5 gn, I get about .6 to .7 moa and I dont see any pressure signs and dont have a chrony. What do you guys think? Am I in the 3300 f/s range , am I way over max and just not seeing the pressure signs.... Im shooting TTSX 140s
 
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Don't want to Hijack the thread but I think it's related : do you guys use magnum primers in your 7RM loads ? Lyman's says to use these.
 
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