I've been doing some research into different bullets as I'm preparing to start reloading for my 7mm-08, and one of the people I've been speaking to has been using some bullets that I was considering in his .270Win and his 7mm Rem Mag. He's in France and hunts mostly driven roe, which are shot at what we'd consider short ranges (10-50m) whilst on the move. Several roe that he's shot have run up to 100m before keeling over, some seemed not to notice the bullet impact. It seems to me that what he's describing may be the effects of a failure to expand properly. That said, they were all good and dead afterwards. These bullets are bonded soft points, 150gr in the .270, possibly 170 in the 7mmRM. Both of these calibres have considerably higher velocities than a 7mm-08, in the region of 100-200m/s faster. Would I be correct in thinking that the very high velocities so close to the muzzle could be behind the possible expansion failure, and that you'd be less likely to experience something like that at longer range, and with a slower projectile?
Having sort of worked out loads and so on, I'm looking into terminal ballistics now. Don't jump down my throat please, I'm just asking!