I need to get some of those. Will motivate the kids.
Colibri's are one load like that and CCI makes CB's that are similar, like 710fps, but they are short and 22long and use a 29gr LRN. I usually use a bolt action mag fed 22lr, so those are not an option, as they won't mag feed, though I have used the CB longs before they came out with the quiets in LR. (you just have to be very careful how you load them in the mags)