Sounds like you have got yourself a bargain there !
I have never seen or used any of these pellets but I do have some experience with the GECO pellets and they really are very good for the money and have always been a very popular choice in our club - along with the RWS Hobby.
RWS CO2 pellets (surprisingly) seem to work very well in lots of non-CO2 match pistols but I have not tried them yet in a match air rifle.
All of the above are less expensive than the top R10 pellets but give just as good results for those that choose to use them.
Rossendale Target Shooting Club. Every Tuesday and Thursday evening 7 - 10pm.