I got a brick (500rds) of it last year when one of the local shops had a sell on Aguila ammo. I ran it thru ALL my rimfire rifles and the 22/45 pistol and had about the same results as ARI did. It hit the target all right, but I could never get consistant groups with it to justify buying it again.
This ammo is very similar to other Hyper Velocity ammo, that being it uses a very light weight bullet ahead of a slow burn powder to obtain the impressive velocity figures. In a carbine length barrel of 16"-18" it will clock in right at the stated velocity, but from pistol length barrel's of 5.5" you will be lucky to get 1250-1350 fps. In even shorter barrels its not worth shooting because you end up with a LOT of unburned powder that it's not funny.
Aguila generally makes good to very good rimfire ammo and sometimes you cant beat the prices. But the Super Maxiums are not one of Aguila's good products in my opinion, its just produced to compete with Stinger's, Yellow Jacket's and Viper's.
rimfirehunter