Be careful that you don't put the cart before the horse as many people tend to do.
Are you shooting at targets beyond 100 yards or at game/varmints beyond 100 yards? With targets at a range, you know the distance. When shooting at something like prairie dogs where distance is unknown, your rangefinder is as important as your rifle and maybe even MORE important. A Dutch guy told me that the BSA Lonestar is commonly used in the Netherlands for 100 meter competition and is slightly more powerful with a slightly better trigger than the Daystate Huntsman. I have taken numerous prairie dogs out to 100 yards and beyond with my Lonestar .25. It is adequate for the job, although no longer available new. Used ones come available at AoA now and then......but not for long. BSA has made nothing since that beats it for long range shooting. The salesman at AoA used one as his personal rifle back when he sold me my rifle in December 2009.
HOWEVER: When I started shooting PD's with the Lonestar, I was using a Bushnell Scout 1000 ARC rangefinder. While it is accurate, it has a fairly wide angle of beam. You will be reading a lot more than just a PD body and will get widely varying readings every time you take a reading. Would not be a factor on something like a deer at 100 yards. Replaced the Bushnell Scout 1000 ARC with a Leica Rangemaster 2400-R (at about twice the price), and suddenly my rifle seemed to be a lot more accurate! The Leica has a much narrower angle of beam, especially in the vertical plane, and it gets a reading much faster. This prevents foreground or background affecting the reading. It also has a higher magnification and clearer optics. This makes it a lot easier and faster to get an accurate reading. It is also more compact and carries in a shirt pocket. The optics are so good that I could leave the 10X binoculars at home. Not having to buy/carry binoculars saves money AND weight and makes moving around easier and ranging is faster since there is no changeover between binoculars and rangefinder. The Leica rangefinder is also a lot cheaper than buying binoculars with ranging capability.
NOW, if you are shooting at targets at a range, this means nothing as you already know the range. BUT, until you get a good rangefinder that works under the conditions you will be using it in the field, and a scope with a suitable ballistic reticle or accurate target turrets, the question of which rifle is better is a moot point among any number of air rifles that are capable beyond 100 yards. But like I said, this applies to shooting in the field under field conditions and not at a shooting range from a benchrest position.
Bottom line: In the field, your rifle will not be any more accurate than your rangefinder. I see a lot of guys on this forum talking a lot about rifles and pellets and scopes, but the rangefinder gets little attention. The Leica Rangemaster 2400-R changed my mind on how important a rangefinder really is, and it is 1/4 the cost or less than the airgun rigs a lot of guys like to hype up on this forum.
