I've had the same experience - the AA Falcon is consistently excellent while its JSB sister design can vary. It's become a fave for my R7 and P1.I think you mean 7.33. Those and the sister pellet, JSB RS 7.33s usually work great in most R7/Hw30 guns. The accuracy with the JSB branding of the same 7.33 pellets can sometimes vary between tins. The Falcons are almost always great. It's worth the extra couple of bucks for the AA of you can afford it.
Mine is a .20 cal and I shoot JSB 13.73s, out to 75 yards and it still has the accuracy and power to hit and latch Crazy Eight paddles out there.Thanks for your comments. I love the rifle and don’t want to tax it unnecessarily. I get excellent accuracy with RWS 7.0 grain wad cutters and H&N 8.2 gr. domed pellets. Tom
Jim Maccari of ARH mentioned to me; heavy pellets in .177 cal. will diminish spring life.You are thinking backwards as far a straining the powerplant. Light pellets will be closer to a dry fire. Heavier pellets should soften the impact for the piston.