Enfield vs Antelope

Please do that post about setting up the sling.
I'd be interested to see how someone else did it so I can have a comparison (& maybe "borrow" some ideas!).
The sling definitely needs fitting to the individual. even swapping out summer & winter clothing has a marked effect.

"The middle sling attachment was already part of the trigger guard on this 1917 BSA and in front of the King Screw.  So ours are a bit different. "

Not meaning to pick on your setup, if it works for you then go for it. But a little bit of info on that loop.

I actually have the same loop on both rifles, it just doesn't show up well in the pictures I posted.

It was originally designed to keep the magazine chained to the rifle (way back when with the MLE & Long model rifles.) & later was just kept as a tie down for the strings on the WW1 action covers used in the trenches to keep the action clear of mud. What this means is that the loop's ends are just passed through the floorplate/trigger-guard & held in with a braze. I'd hate to think the joint, which was designed for much less stress snapped on you while applying tension to the sling.

I zoomed in on the image of your antelope and rifle and was able to see what you are talking about. I have not seen that before. Interesting.