I saw an advert for these in a French magazine and thought it would be interesting to share:
News RWS | Rottweil
RWS are selling this box which contains five rounds each of four different loads in a selection of hunting calibres so that you can find out which best suits your rifle. I think it's a great idea when I think back to how difficult it was for me a few years ago to assemble a selection of different factory loads, and how much it cost me to do so. At the moment, they're only offering it in .308, .30-06, .300 Win mag, 8x57IS and 9.3x62, which gives you an indication of the markets it's aimed at, but nevertheless, it's a commendable effort.