Bob, I ave to ask... I had been taught that a .243 was the perfect weapon for game about the size of a red squirrel. So, if you hate it so much, what do you use on charging red squirrels? I'm going to have to alter my whole approach! I mean, just picture it... I'm in the forest, minding my own business, and an angry, evil squirrel with PMS comes after me in a full charge, ready to stamp my left pinkie toe... and all I have is a .243. I might upgrade to a 6.5 Creeeeeeeeee(no I can't write it) just for that.
And do NOT get me started on that .223 plinker thing.
Ah, the hell with it. Make my 6.5 an M1903, straight from Steyr, Österreich, and I'll be a happy man.
In any case, so much for my sarcasm. Channeling days of a summer spent on a small sandy island of the coast of South Carolina, not far from Savannah:
A proper sling (and yes, a Safari Ching can be considered proper) helps support the rifle
from a supported position. It is not used offhand, because it does nothing offhand. It is used in all other positions because it completes the support.
Imagine this: You have a good, seated position (could be kneeling, could be prone, whatever). If done correctly, you have used your arms and legs to support it against gravity, as well as stabilizing it left and right. There's only one direction for it to go. You pull the trigger, and recoil puts it that direction: the barrel goes up. Ah, but you've looped up ahead of time. It can't go up very much. That's what is meant by "support".
Look at that Gunsight video again. Meaty part of the arm on a meaty part of the leg, not joint on joint, which prevents "rolling". Not a Lead Sled (™), but good support. Sling holds it down. Supported in all directions. If it were an offhand shot, it doesn't really do anything, does it? It might make you feel like you're controlling the muzzle from your tricep, but no, it can go anywhere. Use a sling when supported, don't worry about it unsupported. At the same time, if you can get closer,
get closer. If you can find a more stable position,
get more stable. Sticks are more stable than offhand, if you're not in tall grass then kneeling is more stable, sitting is more stable than kneeling, and prone is more stable than sitting. Jeff Cooper proposed a "rice paddy prone", which to my eyes looks like a cross between sitting and kneeling, and would have benefits in a wet area...
If you really want to get into it:
https://www.amazon.com/Art-Rifle-Je...ds=the+art+of+the+rifle&qid=1633763754&sr=8-1