Suggestion for shoulder holster

No... if you're going to be handling or using the gun in non-emergency situations (like at the range) don't carry it in a horizontal shoulder holster.
Especially a single-action auto like the M1911.
Basically, you'll be pointing a chamber-loaded and cocked weapon at everyone behind the firing line and all of the people to your left and right on the firing line as you turn your body at different points during you shooting session.

It violates Cooper's Rule #2 and it appears (to the public) to be dangerous.

Use holsters that keep the muzzle pointed down at the ground.

P.S. Quick recap on the Four Fundamental Rules of Gun Safety:
1-- Assume all guns are loaded, all the time, and treat them as if they were.
2-- Don't let the muzzle point at anything you're not willing to put a bullet into right now.
3-- Keep your booger hook off the bang switch until the very moment you will shoot.
4-- Know your target and where the bullet will end up if you miss.

..

Shoulder holsters are great to carry a heavy pistol. I had this bullman shoulder holster made for my springfield professional years ago. It was a great holster with nice attention to detail. The problem was the firearm, as the 1911 has such a low capacity it is near worthless compared to a high capacity ak pistol.

Horizontal holsters are easier to draw from, period.