I have read there are limitations to bullets made from .22 rimfire cases, but cannot find them in this forum. What barrel twist rate do I need if I intend to use BTSniper's tools to make bullets from bulk-ammo .22 rimfire cases for an AR-15 rifle? Let's say I have a 16", chrome-lined, cold hammer forged barrel. Powder loads? Dunno yet. What velocities should I stay within with the rifle barrel described? I think most twist rates of rifles I'm looking at are 1:7. At some velocity limit, as I understand it, the (I made them myself!) boolits will not stay together. Please assist, I'm configuring an AR-15 right now. Thanks.