https://rifleshooter.com/2014/12/308...ty-28-to-16-5/
25 FPS per inch
Use this as a reference, but it all depends on your Ammo choice and individual barrel. Chrono is recommended for accuracy, however you can use the @Gibo method of shooting at distance and calculating the drop to determine FPS from the muzzle.
Either way I would recommend you shoot some steel/rocks/targets at the farthest distance you intend to take a shot on an animal to make sure you can hit what your shooting.
Do you own a range finder?
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