hi,
im a big bsa fan.
effective range 5-50 yard depending on wind/pellets and you.
177 all the way id say.
best pellets are air arms or jsb 4.52 in 177 or 5.52 in 22 dont try shooting out to 50 yard with 22 as they drop out the sky,reason why i recommend and use 177 my self.
fillin,pump is fine but if you are not to fit or elder then a bottle is quick,bare in mind youl need to visit a filling shop every few weeks,go for a big bottle to save so many journeys getting it filled.
pump dont have that hassle but is a bit of a mission lol.
i use pump for my standard air tubed rifles and bottle