I have just over 10 thousand rounds through my Kimber kit over the last year and a half or so. After breaking it in with some high velocity stuff (yellow jackets, stingers, mini mags) I've run nothing but Winchester (333 or 555) and Federal 525 bulk ammo. I personally wouldnt have a 22 kit that ONLY ran on hyper velocity .22, spending 8-10 bucks for hyper velocity .22 is encroaching dangerously into 9mm prices. I use my .22 top end for more structured practice on my classic division gun though(mostly just draws, or trigger control, transition accuracy), I dont plink with it much. The only thing Id recommend to anybody to get their .22 top end to run smoother on a .45 frame is to change to a 19lb mainspring. Still 100 percent reliable with .45 and requires less effort to cycle with your deuce deuce.