HeHe...good shootin, nice stories, and keep 'em coming. We love the stories, the stories are good. It's always interesting to me how some folks are troubled by the elimination of cutesquirrels, until they damage something, and then the folks say let the bullets fly. :-)
I have a B21 too, although it is in .22 cal. Those rifles are incredibly powerful and accurate. I really liked the siver arrow pellets too, and used them in my Diana 350 .177, but it was hard to be really accurate at long range with them. Nice looking, heavy pellet at 11.5 grains, seems like it should work good. But I missed too many shots with the silver arrows, and went with Kodiaks and CPHeavies. Then I started hittin stuff real good.
Have you tried the Eun Jin 16gr pellets? I bet those would be awesome in your B21...it definately has the power to launch em. They are roundnose so they aremore accurate than the siver arrow pointys. Range is shortened, but impact is tremendous. They might enter into the rearend and come out thru the nose. Wouldn't that be a sight to see? A pic would be in order.