That list is ludicrous.
Fire a 1" grouyp at 800 yards from the prone unsupported position? Who the heck does that guy think he's kidding. Benchrest rifles have a damned hard time turning in that degree of performance (1/8th minute of angle) And no human can hold that sort of precision, your heartbeat, blood pressure or lunch moving through your intestines will introduce more error than that into the picture. At 800 yards a good sniper rifle can mechanically manage to deliver maybe a 2-3 inch group with match grade ammunition. Most expert shooters will probably effectively limit the performance of their rifle to maybe a bit under 1 MOA.
Hitting a 5" moving target at 800 yards is a friggin' pipe dream. It might be doable, but the sniper who does it is going to be hard-friggin-serious-core and not some weekend warrior militaman wanna be.
Just plain nutty.
And where exactly is a "militiaman" going to get all that training and keep it current? He is going to enlist in the US Army, try to gut through RIP and Ranger School. Re-enlist with an SF option, attend the selection course, Q course and specialist training, then cross train in other specialties during thr next four re-enlistments. By then he's in for twenty at least and not likely to end up as a so-called militiaman.
Probably the best things a member of the non-organized militia can do for readiness is practice marksmanship skills, practice fieldcraft, maintain good physical conditioning, take regular first aid training, and get an amaterur radio license. Doing those things will build a good foundation upon which everything else can be built.
All the super-high-speed military training is nice, but without the rest of the super-high-speed military organization and equipment the training is built up around, you're still not as effective as a properly fielded SF ODA and if you tangle with one, chances are you are gonna get spanked when they call in fire support on your ass. They have it, you don't.