Magnetospeed

I should clarify, I use Hi 2 on a magneto speed sporter (highest of 3 settings). The setting might be different on the regular model. Either way, turn up the sensitivity.
I have an older MagnetoSpeed V2 with the head unit that has multiple settings in the LCD display. You can toggle between them. It's more advanced than the MS Sporter model. The MSv2 has a setting just for .22LR and rimfire using lead bullets with no copper jackets on them.