Been looking at the PCP big bore air rifles for a short time now. I am finding them interesting to say the least. The Air Force Texan in .458 caliber has caught my eye. I'm new to these rifles and am curious what to expect as to using and performance this one claims 405 grn bullets at 900 fps. How difficult is the charging of the rifle? They claim 3 good shots. I see "buddy" tanks and read of shooting teathered. This rifle operates around 3000psi and from what I have read the buddy tanks are charged to 4500 psi. Ive seen booster pumps for charging also. Any information offered will be greatly appreciated. Thanks in advance. CG