The best BC are the Crossman Premier14.3gr HP and it's more about penetration on 20-30lb critters with a air rifle.Drill them in the head.Out of my Wiehrauch HW80K/.22 800fps 1" lumber is blown right through at 20 yards.Grouse can either be head shot if your eyes are still sharp enough or shot through the wingbutts/back and they stay put with no meat damage.You can eat right up to the bullet hole.And its quiet.They make some in .25 cal that will handle coyotes at 30 yards [headshots] and .50 for wild boar and deer out to about 75 yards.Air rifles were used in war since the 1600's in large calibers and if the pellet didn't kill you the Doctor would back then!The Austrian army had air rifles with airtanks built into the detachable butstock[recharged with a bike type hand pump]and they simply changed to a full stock in the middle of battle much like todays clips.Napolean's troops were terrified of airgunners because they didn't give away the shooters position like black powder.What you don't see ,can kill you................Harold