News flash,
Not everyone is an old fart or grumpy, some guys posting here in the negative are active or just recently inactive.
You can still accomplish the mission without a 20 round magazine, I was actively teaching the military up to 2011 (7 years), that is when I stepped down from RO. So old is relative in this case.
And I talk to active duty guys all the time, feedback is continuous and because I am public (Read easy to find) I get calls and emails all the time from guys who don't agree with the training they are currently receiving.
( I will agree with your opinion of me, no issue with anything you wrote, I am old(er) but my curiosity level is high as well as my access to current warfighters. )
Certain tactics are tested by time, just because people can deviate from them does not make it better or worse, just different. Accurate fire is never a bad thing and if someone moves and a single shot drops them enough times they will think better of it. (granted some of the current enemies are too stupid to take cover, but that is a different conversation)
In response to "old is relative", you're correct, I casted a pretty wide net with that rant but the core of what I was addressing is snipers allowing their situational awareness of new technology and techniques to degrade and decay as time passes. When I hear cries to return to the the old days of "one shot, one kill and phrases like "White Feather Days" it's often an indicator that somebody is stuck in a nostalgic fantasy, sometimes it's older senior snipers that seem incapable of embracing and adapting, sometimes its dudes that have no idea what their talking about. Again wide net and probably a unfair generalization for most caught in it.
As for accomplishing the mission without a 20 round magazine, I suppose it depends doctrinally on where you look. Stictly observing traditional precision interdiction roles, no, 20 rounds on tap is rarely need but. Looking at my experience coming from a special operations background and the mission sets we support, I truly believe the capabilities that a SASS brings to the table is mission essential. The ability of a SASS to continually project precision fires at intervals 2 to 4x the rate over a bolt-gun is an undeniable advantage whether supporting unilateral Direct Action raids or herding commandos during clearing ops. In 2012 I literally had the misfortune of having to press a M24 back in service as a primary SWS in support of DA raid, yeah she did work but top feeding rounds while I could/should be at work, is not a great feeling.
On top of that I'd double down on the argument for SASS/SPR's as mission essential when considering maneuver aspects of current conflicts. Running and gun with a bolt gun vs. gas gun is a no brainer. Now I know I'm preaching to the choir with you Frank, you may have been born at night but it wasn't last night but allow me to underline and restate a truth for others:
You simply cannot shoot and movie a bolt gun as dynamically at the same speeds you can run a gas gun. Once you get off your face and are running a bolt gun in extremis, it probably requires a transition to carbine or pistol, the former becoming a weight penalty (my Mk18 came in at 12.5lbs loaded out the other day) or in case of that latter your taking a range and lethality penalty. With the SASS/SPR's you have the answer right in your hands, I not advocating CQC with SWS's but a SASS gives you options a bolt won't.
For those that think that this in extremis situation is an unlikely or irregular even for small isolated maneuver elements operating along the forward edge of battle or well beyond in support assets in denied areas, I'd ask you to look hard at our current conflicts and the way our forces are prosecuting missions. I'm not sure I've ever been employed in support of a BN size operation, even while serving in the Marines and beyond some major operations durning the early years of GWOT, I feel that the vast majority of snipers are supporting operations at the company level. Personally most of my sniper employment experience consist of 2 to 6 PAX elements operation beyond orgainc support of the main effort. In fact only ever seen a sniper platoon employed as whole once while assisting Aussie 2nd Commandos.
Coming back around to "one shot, one kill" capability and mentality...it's never gone anywhere as far as I can tell. Every sniper school I've attended observed or instructed has placed, a premium on first round impacts in regards to sniper marksmanship. I know for a fact SOTIC/SFSC has maintained POIs that require a minimum of 50% first run hits durning the KD and UKND exams out to 1000m. I also believe the live fire low precentage shot was Go/No Go cold bore shot but I cant remember. Even the SASS exam at Lv. I pretty much dictates 50% first round hits from alternate positions, on both deliberates, snaps and movers out to 600m under time.
Talking with peers from other services, I'm fairly confidant that other school house such as Big Army and Marine Corps have not dramatically shifted curriculum to support "cone of lead". Not sure what SEALS are up to though, but they rarely lead the field in innovation when it comes to sniper TTPs.
On that note Frank, I'm honestly interested in where you see the shift in mindset towards the "cone of lead"? Without argument your perspective and exposure teaching at RO offers a broader coverage then most of us have but I'm not seeing it at the institutional levels and Todds sphere of influance seems to have waned considerably since 13'ish timeframe, at least in the circles I travel. Most dudes (less some impressionable Rangers) have realized Todd for what he is regardless of how the contracts are writen.