01-29-2015, 12:49 AM
I know that you asked about a recommended short magazine, but what I find what works best when shooting off a bench is either a magazine with a single load follower or a single shot sled used for the slow fire stages in Highpower. If you've never used one, the bolt locks back after each shot, you lay the loaded round on top of the sled/follower, drop the bolt (bolt release or charging handle) and shoot.
Another benefit is that you can wait until you're ready to take your shot to chamber the next round. If you're using a powder that is temperature sensitive, you'll won't be heating up your next round in a hot chamber as much as if you were shooting semi auto. Any AR15 magazine with a single load follower or an AR15 single shot sled will work with any AR15 caliber. No need to own more than one for all your ARs.
Another benefit is that you can wait until you're ready to take your shot to chamber the next round. If you're using a powder that is temperature sensitive, you'll won't be heating up your next round in a hot chamber as much as if you were shooting semi auto. Any AR15 magazine with a single load follower or an AR15 single shot sled will work with any AR15 caliber. No need to own more than one for all your ARs.