Straight from Galco
it sounds like you just need to break in your holster, and to pay special attention to the strap. Our holsters (especially the black or Havana ones) are normally quite tight when new, and yours is a common question. To break in the holster, begin by working the leather with your hands, bending and flexing the holster in all directions. Don’t fold it in half or anything, but don’t be afraid to flex it. This will warm and stretch the fibers of the leather.
After flexing the holster body for about ten minutes, begin working on the strap. Pull it, bend it, twist 90 degrees in both directions, and flex it. Do this for another ten or so minutes. Finally, take the unloaded pistol and jam it into the holster as far as you can possibly make it go. Take it out and jam it in again. Do this about 20-30 times. Pull the retention strap while you jam the pistol into the holster, to help stretch the strap.
Once you’ve done this, you should be able to secure the strap. You may need to work the strap a little more, but the above procedure usually works quite well. Think of it like breaking in a baseball glove or a new pair of leather shoes.
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