It makes you wonder if the extra 5 step honing process the real Bergara barrels receive includes air gauging and how much variation is considered acceptable.
A light knurl on the Thor above the skirt might help tighten it up.
I wondered that too, because two of the guns were V2's.
I did try to knurl the Thors. It only helped a little. I didn't trust the bullet to stay on the powder while hunting.
I had come up with a temporary plan for the hunt. I used one of the bigger Thors that wouldn't start down the muzzle, and loaded it through the breech a little past where it would sit over the powder. Then I poured in the powder through the breech, screwed in the breech plug, and rammed the bullet down on the powder from the muzzle. It worked, but was slower loading. I marked the ramrod so I knew how far to push in the Thor from the breech.