Rick,
I've been using Winchester T22's in my S&W 41. I have the impression that the S&W 41 is set up for mild target loads while the Browning is set up for more general purpose usage. As a non-relevant side issue, I get about the same velocity from both the T22 and the wildcat out of a six inch revolver.
Both examples of the 30 Luger necked down to 22 in your pictures look like they would work in a single shot pistol, but the OAL would be wrong to go through the Luger feed system.
I know of three wildcats based on necking the 30 Luger down to 22, but next to nothing beyond the fact that they exist.
If I get into this, I'd like to think in terms of something that would feed through the Luger. I've also thought of using a sabot to run a 22 bullet in the 30 caliber barrel.
The next question, is can one gain enough velocity to make it all worth the effort? Seems like you would want to reach 2000 fps to justify the effort, but would the pressures involved make the bluing fall off the gun? I'll have to sit dwon and run this on paper and see where it comes out.
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