20in bbl RE17 or Superformance gets me ~2830 FPS with 160TmKs or 162AMAX.
This was consistent across 2 different rifles REM700 & MK5 Weatherby wearing 20in bbls. For comparison my Tikka 284 (not a factory bbl) I rebarreled at 22 in. This gets me 2930 FPS with 160 - 162gn pills with RE17.
“Best” bbl length is really a question about your intended use & type of hunting. If you’re a bush hobbit and want to occasionally reach out to 5-600 yds then 18in would suit well. But if you’re alpine tops hunting and want 7-800 or more then you would be better off 20+. Horses for courses
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