Thread: Shortening a CZ455 varmint barrel - how short to go?

Most subsonic ammo seems to be pitched around 1050 fps, a good 75 or so fps below the average speed of sound 1125 -1150 fps. So its at the bottom of the transonic range. Low pressure weather systems can lower the speed of sound a few fps as can hot weather but these are just academic.
You shoot with a silencer I guess after cleaning Id start again, see if you can get some cci quiet or winchester z to use as a benchmark then go back to your preferred round. Also if you have the opportunity try them in another suppressed rifle. Your 1022 may not cycle properly but would be a good test bed if its threaded, and you could always use it as a straight pull.