if you do get a walther talon or falcon man00, if I were you i would seriously concider it in at least .22. It is a big gun with big power and i just cant imagine it shooting a little .177 slow enough to get the accuracy you may want. Maybe it does, I dont know myself. I imagine the average lead .177 pellets will all just break the sound barrier when the gun is 26 fpe. It seems to me also that a light .177 pellet could be bad for the spring also. Thats just my theory though because of my personal experiance with its awsome power. make sure you get a newer version if possoble. I know that the batch they got in at pyramid air on july 7, 09 are the newer versions and are solid as a rock. After you shoot a few tins through it, it will smooth out perfectly. For me, the kick of repeated shooting during the first tin of pellets literally tore the skin off my middle finger. It left blood and skin on the back of my trigger gaurd. i got a scar there now on my second knuckle. It dosent kick that bad now but Its definately a mans gun.
also, you might wanna shoot it a while and let it smooth out before you put an expensive scope on it if you wanna keep the scope.