Target actions are single shot short action with the" target Accu-triggger".
Varmint actions are repeaters with the "varmint Accu-trigger". I think currently they are all short action, but has not always been that way.
LRP is a Standard action with a "target Accu-trigger" with a HS Precision stock and a DM.
Hunting models have the same action as the varmint except they have the "standard Accu-trigger".
Hope this helps