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Set your dies up for minimal shoulder bump. Don't mix headstamps. Keep them in batches that have had the same number of firings. Clean the lube out of the inside of the cases after you've resized...

But your 7RM was nice and consistent during the same sessions over the same chrono?

If 300's your limit and it groups well out to 300, so what right?

You could chuck highest and lowest velocity...

Are you using a suppressor? What's the extreme spread like over 5 shots without it?

I've seen the first shot through a suppressor come out at higher velocity. But 2770-2900 is quite a high extreme...