The Army (or Marines, forgot which) bought all of their M24s in long action so they could be easily converted for future use, so the .308 in this system is long action. Several companies make long action .308 bolts/actions for Remingtons.pardon my ignorance...when is .308 long action?
Generally, it'd refer to how far the bolt travels from it's furthest point rearward to to point where it chambers the round. Longer rounds need longer actions. For example, an R700 SPS Tactical in .308 is short-action. In .223, it's super-short action I believe. If it was available in .300 Win Mag, or .338 Lapua (among several other calibers), it'd be long action.and yet no one answers what "long" and "short" action is...guess we can google it.