Thanks for reaching out Harry! This is exactly the kind of 22 LR I'd choose for a semi-auto like the 10/22. Its 40 grain bullet and supersonic muzzle velocity mean it should generate sufficient chamber pressure to reliably cycle the rifle, and a copper-plated round nose bullet should feed smoothly and prevent accelerated lead fouling of the barrel. "Super Extra" is just Aguila's brand name for this line of 22 LR ammo – it means nothing as far as actual performance is concerned.