SHELL SHUCKER is quite correct when he says that a faster twist barrel is the way to go. Aguila itself makes this recommendation on its website.
"
The faster barrel twist of the projectile ensures accuracy for target shooting and small-game hunting without excessive noise. Recommended for use in barrels longer than 20″."
The muzzle energy of the Aguila 60 grain bullet at about 950 fps is 120 foot pounds. By comparison a SV 40 grain round at 1080 fps has a muzzle energy of about 103 foot pounds, while a 1250 fps HV 40 grain round has a ME of 138 foot pounds. High velocity 40 grain .22LR ammo continues to deliver more energy down range.
Because the 60 grain round has a short case and an extra long bullet, the bullet engages the rifling mid-way, rather than closer to the base of the bullet. Some users say this may contribute to lead and combustion material build up in the leade area, but whether it's a serious issue is not clear.
If there is a consensus about the round on the largest rimfire forum, RFC, it's that the round is best used in faster-than-standard twist barrels. Further, the round is not especially accurate (Aguila generally are not).
Since it performs best in a faster twist barrel, the accuracy is not especially good, it has a lot of drop at longer distances, and the muzzle energy is less than .22LR high velocity ammo, there seems little to recommend it, except, as SHELL SHUCKER notes, a novelty, something different for it's own sake. Of course, that appeals to some shooters, and there's nothing wrong with that.
