I've been handloading for 20+ years but need input. I'm working up loads with a CVA Cascade SB with Suppressor (308 Win) with TAC and 150 SST. In March I used 45g TAC, Sig brass and Fed 210/cci 200 primers. Groups were 1-1.5 moa @ 2700. Last week I swapped primers for WLRM and velocities were 2850! Groups were sub-moa. Thinking my chrony was wacky, I tried again this week and lowered the charge to 44.5 TAC. Verified the pro-chrono was working with other established loads. It shot the groups below at over 2800 again. This is 1.5 grains below max and I'm trying to figure out 1) why the increase in velocity (mag primer and/or 50 temp increase) 2) am I red-lining this load? My initial guess was 2750 would be a good max for an 18 inch 308 but it is "efficient". Thoughts?

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