IMFDB says that a Ruger SP101 is in the show at some point, though they don't specify where. I know nothing of Ruger revolvers so I can't comment one way or the other.
http://www.imfdb.org/index.php/Breaking_Bad
That Benelli you sold Jason slays some fucking bats.
I tend to take the lower altitude ones with the Saiga (no choke), and he tends to nail the ones at the higher altitudes since he's got a bit more reach than I do.
19/20. The merging question was horseshit. I went for the legal answer which was 'go the posted limit'. In reality, I'd go as fast as I needed to merge smoothly.