seems to me that a lot of this has to due with round in chamber, rather than down range; If your bullet is seated too far back, and has a chance to 'wobble', before is gets to the lands, your barrel is going to vibrate, and your bullet is not stable when it leaves your gun;There's more than one reason for this, but it is at the gun end, not the animal end; head space, throat dim, OAL, and other things will affect a bullet more than when it hits something;
