Riflemen
(H/T:War on Guns)

If you are worried about running out of ammunition then load more magazines. Stripper clips are faster than loading loose rounds, but are still a bit fiddly. You wouldn't want to be loading magazine under fire either way. Skip the stipper clips and use the savings to buy more magazines. I would argue that a double basic load of magazines (12) is probably sufficient for most purposes. 336+ rounds should either solve your problem or give you an opportunity for resupply or battlefield recovery. A private citizen or law enforcement officer would be hard pressed to need to need to reload a rifle more than once for anything short of a zombie invasion.

Far be it from me to encourage people to settle for substandard marksmanship, but their really aren't very many 500 yard engagements. The US Army standard the last time I checked was 36 hits on 40 targets and the maximum range was 300m. In fact if you hit everything and didn't fire on the 300m targets you could still qualify as expert. More important than individual marksmanship is the ability to work as a team, but that is a lot harder to coordinate training for.

The 'lone wolf' sniper rant in the essay just makes me think that the whole thing is silly. While I agree that too many 'individuals' will spoil an organization, individuals roaming the battlefield looking for targets of opportunity is probably more likely than mustering the militia even in squad or platoon strength. Most of the militia movement strikes me as romantic fantasy. I would give it a lot more respect if rolled out for wildfires or search and rescue, or any of the FEMA volunteer programs.