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( query regarding Solo velocity readings)
Correct though they are still rather at variance with the best calculated vels based on accurate chrono readings (Oehler 43) and matched drops

but it's a planet better than the previous iteration

Not quite. Besides the 8mm calibre limit, there is a 5000 Joule (3680 ft-lb) energy limit on any NRA range. So your 7RUM would be out.

It's also desirable that you have a known 300yd zero. Many...