Accuracy International is the standard by which other detachable box magazines are measured by.  These are available for short or long action.  Specs on all variations are:   AICS 5 or 10 round – Double stack, single feed. For your 308 and similar based cartridges (6.5 Creedmoor, 243 WIN, 6.5×47, etc) This is the magazine you should choose if you have a Remington 700 or other clone that is NOT compatible with AW magazines.  2.89 OAL AW 10 round – Arctic Warfare Magazine.  Double stack, double feed.  (6.5 Creedmoor, 243 WIN, 6.5×47, etc) Only choose this magazine if you have an action cut for the AW specifically, this WILL NOT fit an unmodified Remington 700.  Examples of actions cut for AW are Defiance, some Stiller, some Bighorn, maybe others.  2.95 OAL AICS 300WM 5 or 10 round – Single stack, single feed.  Use this magazine with your 300 Winchester Magnum, 284 Win, or other similar cartridges. 3.625 OAL AICS 338LM Standard – Single stack, single feed.  Use this magazine with your 338LM standard length cut actions.  Works well with the 300 Norma Magnum as well. 3.65 OAL AICS 338LM CIP – Single stack, single feed.  Use this magazine with your 338LM CIP length cut actions.  Works well with the 300 and 338 Norma Magnum as well. 3.77 OAL