Originally Posted by luvsmiths

I would imagine that "the guy at the factory" is test firing a whole lot of whatever caliber this winds up being, and isn't handed a whole pile of different caliber guns to testfire, with a mountain of different caliber ammo to take his pick of.
So- "the guy at the factory" didn't need to think. He just needed to fire his test guns with what ammo was supplied for that particular run of test firing.

And a 44 Mag wouldn't fit into a 41 mag cylinder.