Not to diminish the abilities of many high power shooters but I wouldn't call a shooting jacket, sling and glove unsupported.
Agreed - highpower isn't exactly the same as field shooting in a T-shirt with a sling around your arm... But alternatively, I've never shot as tight of group standing in my Freeland or Creedmoors as I have when laying down on a Sinclair or Bald Eagle, and haven't met a shooter who could.
So my point was more on line that it's not really impressive to stick a 6.5 creedmoor or 308win on a harris, whether on a bench or prone, and walk hits onto a 5-6MOA target at 1000yrds when guys are doing it standing with a 5.56/223, jacket or not.
As I said before - nobody sits down at a bench with the types of rifles about which we're talking here and then brags about a 5-6" group at 100yrds. So we're talking about the effect of adding 900yrds to a 1MOA, 100yrd group. Elevation is just a matter of knowing your actual MV and conditions, so the challenge is the wind. Taking off a 1moa group, on a 5-6moa target would mean a missed wind call somewhere around 4-5mph, or a touch more. So you either missed a 10mph wind by 4-5mph, or missed the direction by 50-60degrees. If a guy can't read better than 4-5mph, they just can't read wind, and a $30 Caldwell Wind Wizard will solve that problem. If a guy can't call direction by 50-60degrees, I don't want to be on a firing line near them. If a guy is shooting in gusts, calling 10mph for his shooting condition, then breaking his shots at 5mph or 15mph, they're not good at reading wind, or they're not patient enough to shoot in variant wind...
Sure - any shooter should be proud that first time they walk a shot onto a 1,000yrd target, but if a guy is regularly shooting 1,000yrds, life should be smaller than 63". Don't get me wrong, nothing at 1,000yrds is free, so there are days where a 4MOA target feels like a pin-head, but a guy capable of sub-moa groups at 100yrds, who knows his trajectory & owns a wind meter, shouldn't have trouble finding a stable enough wind condition to get their finger on a 5-6MOA target at 1,000yrds pretty regularly.
Recognizing, that is coming from a my perspective after shooting my entire life in Kansas winds. I'm not "good" at reading wind, never have been, but I've never struggled to compensate for wind in my shooting, even living in a location where if the wind ever stopped blowing, we'd all fall over.
What does "bang steel at 1000 yards" even mean?
It is exactly what it sounds like - shoot a rifle, and bang into a steel target at 1,000yrds. Nobody can see holes in paper at 1,000yrds without some one in the pits plugging spotters into the target, and walking/riding back and forth between every few shots is annoying as all get out, it's especially popular to shoot steel targets at longer ranges.
Generally when folks use that vernacular, however, it's a shift in mentality. I coach/instruct a lot of different shooters, and shoot with even more - you can see the difference in their moods when you have a piece of paper out there vs. a piece of steel. On paper, guys will pick their exact POA, and shift their POI to even smaller than the nearest 1/4MOA - dialing as much as they can, then even holding a half a crosshair to one side or the other of their POA dot. I see steel shooters relax a lot more, picking a comfortably floating POA on the plates, then being happy as long as the POI is generally close on the plate. For a circular plate, most guys still use a center hold, but then if they drop a 1MOA group a half MOA off center, they don't seem to worry much.
So "banging steel" tends to be a similar mood, in my experience, to the other colloquialism, "Minute of Deer," and much less related to precision paper punching.