Ah, if your only shooting at 50yds I can see your point I guess. But you still got squirrel accuracy at 50 yds with those cast bullets.
Well with cast your supposed to start load development at 50yd....for some reason, idk. The cast bullet community is so weird. If you start at 100yd with a 10rd group ya get told that too long and too much, back up to 50yd with a 3 red that too short and not enough

idk about all the cast load manuals ( that I barely use funny enough) all do their loads @50yd so idk. That being said I'm not gonna push most of my cast stuff past 200yd max. 30-100yd is gonna be about average.
But again I feel for the most part either army rifles just plain don't care or I just really don't have the whatever to really be able to see much of a difference. Might also to with the face most of my barrels are more on the bull side . Also since I shoot mainly from a bipod it might have something to do with nullifying the harmonics.. possibly.
On another note I do feel a lot of it could be one of those things where people basically make something not work. Like I see many times if someone thinks something won't work they won't put alot of effort into it like they usually would and when it doesn't they go " SEE TOLD YOU !" Like they strap it on mentally check out because they already know it's gonna shoot like crap and proceed to shoot like crap.... Not saying that's eveyone but it's definitely a possibility.
Also I if your one of thesr bench rest guys with SUPER TUNED rifles and loads where you gaugeing your groups in the .00" then yeah definitely can see it making a difference or at least being much more noticeable at theat level....but at that level EVERY LITTLE THING makes a difference ( I Mean heck they adjust their loads on the bench as the temperature goes up " of went from 80° to 81° ? Time to add another kernal !) soooo yeah