This is just a thought and also to see if any one else has done it. Has any one heard of or seen a 6x221 fire ball or 25x221 fire ball. I know these are not going to be a long range cartridge but they seem almost perfect for a short range ground squirle cartridge. My ground squirling normally ranges from 5-150yrds with 300yard shots being far. I mainly use a 22-250 and a 22lr for ground squirle hunting. both have there advantages. 22 is cheap and dosen't seem to scare the squirles as much. Problem is that it has a limited range. the 22-250 is flat shooting but gets hot real quick when the squirles are out. The 22-250 also spooks the squirles more than the 22. Hence the thought of the 25x221 or the 6x221. This may also run acroos a close range chuck or two.