When I was a kid the drive to my grandparents house took us past Mr. Clark's shop. In a family of non-shooters It took a bit of doing, but I finally got an uncle to take me there. A very good memory. I promised myself to build one of these (.224 Clark) someday, and with my kids college nearly out of the way-I think someday is here! My questions for those with experience along these lines: Which case should one build a high velocity on .22 these days? Which bullet? Mr. Clark built his own I don't, but would prefer shooting the heavier for caliber bullets. I won't hunt big game so accuracy would be the primary goal. Frangible would be good but not essential. What barrel length, contour, and twist for the bullet you would choose? Any other advice?