Gentlemen,

foreword:
I am looking for a rifle in .308 Win. which will be used for following wild boars in heavy-wooded or brush thickets. The animals are normally shot badly (i.e. gut shot) by hunting guests and I have the task to find and shoot the boar.
Shooting ranges will be very close (0-20 meters) and several shots will be fired in a hurry for either preventing the boar to tackle the hunting-dog or the dog-owner or to prevent the boar from escaping another time.

possible problem solving:
A semi-auto rifle based on a Heckler&Koch roller-locking action in 308 Win was offered with a 265mm barrel (= 10.4 inch) with polygonal rifling.
The salesman told me that the muzzle blast and velocity loss was not severe.
The rifle will be equipped with a detachable muzzle flash-hider, but
test shooting will not be possible, the rifle shall be sold in "new condition"

What do you think?
- Shall I buy it and load ammunition with fast burning powders ?
- or skip the idea because it will be a very loud blinding device after the first shot (like treated with a stun grenade explosion milliseconds before the boar arrives at my legs)?

Any ideas and suggestions are welcome!

best regards
Rolf