I cant speak to European Drive hunts; but on the one drive hunt Ive been on in the US (a game preserve), firepower, as in magazine capacity wasn't needed BUT quick kills, as in appropriate calibers was a HUGE issue.

I was appalled to see a couple of guys using .44cal Cap & Ball revolvers. On the flip side the rest of us, who were using calibers suitable for Whitetail and larger had quick kills.

If youre concerned about making multiple kills, Id practice making good shots on moving targets, and I suppose reloading without fumbling. I tend to use SxS's whenever possible, so I got used to carrying a reload between the fingers of my off hand. If you use a bolt gun, take some measure of HOW you carry your spare ammo-Is it accessible?--Is it easy to grab and load??---Do you have enough???