I have PCP's in 4.5, 5.5, 25, 30 and 357
For hunting medium size animals 30 Cal is ideal. For Hunting larger animals (deer) 357 Cal is more adecuate.
For shooting targets and small animals 22 Cal jsb pellets redisigned and 25 cal are the adecuate choice.
If you would like to save money, pelletsand time, buy an Uragan from Airgun Technology or a Vulcan 2 From Airgun Technology. I have both (also some Daystate, FX, Brocock, Air Arms, Evanix, Jager, JKHan, Marauder, et al)... Best buy, by far, is the Uragan and immediatly after, the Vulcan2.... You won't ever regret.
If you may only buy one Uragan buy ir in 25 Cal.
Ir you may buy two Uragans buy them in 22 and 30 Cal.... Later on you may buy a. 357 for big hunting. Ir you have these 3 rifles you won't ever justify to spend more money in pcp's rifles.