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For National Ammo Day I bought 50 rounds of Agulia .22 Colibrí to try in my basement along with an assortment of other .22 LR to see what my H & R Sportsman break-top nine-shot target revolver and my Ruger 10/22 rifle like to shoot.
Colibrí is Spanish for 'Hummingbird'. This round has ballistics similar to a Crosman 2250 pellet pistol. It has a 20 grain bullet (a BB is 8 grains) propelled by the primer only, with no gunpowder. The published velocity is only 375 fps with a muzzle enery of 6 ft lbs.
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I also shot a couple at close range from the H & R, one at close range from the 10/22 and nine rounds each double and single action from the H & R at twenty-one feet. The sound was more like a loud "fft" than a bang with my hearing protection on. My family on other floors of the house said it sounded like hammering or hand-clapping. The furthest any of the rounds penetrated my backstop was through nineteen layers of corrugated cardboard and 24 layers of newsprint. I was able to recover 26 of the thirty rounds I shot.
I was very pleased with the results with one very important caveat: Ventilation. I probably won't shoot more than five rounds at a time until I figure out how to ventilate my basement properly. Breathing burnt primer is not for me. Still, this is a lot cheaper than the eight dollar range fee, and I can work on trigger control and sighting just fine at short range, so if you have any suggestions for ventilation please comment below.