Possible, but unlikely. The .50 Beowulf isn't a super common round. It's more likely that Beth just didn't want to make a separate model for the .50 cal rifle. I think I would have preferred that they were separate weapons, with the hunting rifle having a higher firing rate and the .50 having much higher damage. Ah well, can't have everything. You're right on the .44, though. I don't think I've ever seen a .44 that looks like the one in game that was a single action. I'm not saying it's impossible for one to exist, I'm just not sure why you would take a modern weapon and remove the double action from it, since you can fire a DA like a SA if you want too anyway. Actually, now that I take a closer look, this doesn't make sense either. I don't use the pipe-bolt, I can only speak for the bolt-action. If you mod the bolt action to chamber the whatever .50 you can see the 308 has a fire rate of 6, and the .50 a fire rate of 7. In the bolt-action (and the pipe-bolt) the fire rate is how fast the character actions the bolt. It's just that they put the animation to the left slowing the bolt-actioning movement even more. And the revolvers suffer from the same problem: even if you mod the fire rate making the char discharging the gun like the "Deliverer", you'll see him/her moving his/her thumb like Flash.