Sorry, but if the S&W K-frame handled 357 without problems S&W never would have made their L-frame revolvers; stay away from K-frames in 357 the forcing cone will crack after firing a thousand or so 125 grain defense loads.
A J-frame handles 357 much better than the K-frames, despite the greater...
I agree with gassing for executions, just think that carbon monoxide should be the gas used.
It's faster, as it bonds with the hemoglobin in the blood, which nitrogen doesn't; and because of the bonding action it prevents the person from feeling that they are being asphyxiated, which still...