I've heard accuracy is marginal with the 223's, and okay with the 22-250's
I am waiting for the 20 cal stuff to show up. 26 gr out of the 204 should be around 4500 fps. BC will be lousy though, so it will run out of steam fairly quickly. Should be able to point and shoot up to 300 yds and watch skippy vaporize through the scope. I hope they are accurate cause it's no point in using them if you can't connect with them. My 39 gr sierra blitz kings will shoot under 1/2" at 100 yds all day long. If the grenades can't do this, then it's no point in using them. The blitz kings have excellent red mist and helicopter action with the prairie poodles.