I think if you have a sling attached to a barrel band it makes the sling purely a "carrying strap". I believe using the sling on a barrel band as a rest will mess up your shots somewhat.

The protruding swivel stud or swivel on heavy recoiling rifles can injure your hand as Westley Richards mentions, and probably it is anticipated that precision accuracy and long range shooting is not the normal for big bores.

Plus a lot of people remove the slings when hunting nasties especially in thick cover

There used to be sling swivel with the "studs" recessed into the forend. These would solve both issues.

Christer
I would be interested in any comments of the Safari Ching Sling when your's arrives