If you are considering a true 10 M Olympic style rifle, they are all .177, and I think tuned to shoot a 7-8 grain pellet around 550-580 fps. I believe they mostly use wadcutter style pellets, and I'm sure that testing different pellets is the standard process. It is a specialized and demanding sport. If 10 meters is simply the distance at which you'll be shooting, but with a more general purpose rifle, then your choices are unlimited. And yes, lower power and lighter pellets will probably br best. I would suggest one of the 12 fpe rifles that are the standard in England and many other countries. I recently tuned my Weihrauch HW100 to 11 fpe, and the shot count and noise are both greatly enhanced.