Umarex Notos build/accuracy questions

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I used 21 grain baracuda 5.52s in my notos and they shot on average 666 fps lol. It was Hell on sparrows and squirrels! Quiet little hammer.
lol i know what you mean! i’m using 23 grain nsa around 675 fps and tagging pest birds out to 50 yards. so slow i can see the slug hammer down on top of them 😆 one bird even tried to fly away cause it heard me shoot but instead flew in the direction of the slugs trajectory. knocked it out of the air about 2-3 feet from where it took off flying.that would have been awesome to have recorded.