I compared my old Pro chrono (pre-digital model) against the Magnetospeed V3.
Out of five shots, three were within 1 fps, the other two were quite different but I put that down to the wind/muzzle blast having angled the Pro chrono a bit.
40 gr of 2209 seems to be a sweet spot for my Brno 243, had good groups with 85-100 grain projectiles, but my go-to is the 90gr ELD-X in front of 42.4gr, doing 3140fps
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