You seem to have a lot of experts here who have firm and differing opinions. Here is what I know...

I have shot .22 cal. benchrest rifles in competition since 1977. For 50 to 52 gr. bullets I have always used a 1 - 14" twist. I'm currently making a .222 gun for competition and it has a new Douglas barrel in 1 - 14" twist. The 14" twist works perfectly in a duece at 3200 fps and, also, in my favorite BR cartridge, the .22 PPC, .100" short, at 3500 fps.