Devastator cartridges adorned the shelves of my friendly local gunshop in the early 1980s. Fortunately, they were champagne priced and I was living on a beer budget at the time. I never wasted my money on any. And a waste they were, if they exploded, they would fail to penetrate. If they didn't explode, they would penetrate, but do no more damage than a much cheaper solid bullet.
Hollow points back then were not quite as developed as they are today. Lots of gimmicks were on the market. I don't miss the Devastators.
I don't miss the .357 revolver bullets loaded into .38 Super cases from that time either. Fortunately, Winchester soon developed their Silvertip .38 Super.
The old RG pistols were indeed pretty poor, but they would hold together long enough for a purpose like Hinckley's. Traditionally, presidential assassins have not chosen quality type weapons. JWB seems to be the only exception.