barrel with offset bore ???

Yes, peak operating pressure, which hasn't dropped all that much by the time the bullet clears the muzzle gap on a revolver.


"9mm has a high peak pressure because it has to do what something like .38 does with a much smaller case."

The 9mm does NOT do what the .38 Special does.

The ballistics are NOT similar.

9mm ballistics are far closer to .357 Magnum ballistics.
 
One of the first rifles that Hiram Maxim successfully suppressed was a Model of 1903 Springfield in .30-06 (IIRC).

The amount of gas produced by a full bore .30-06 cartridge is significant, yet the device was so successful that it couldn't be heard 10 yards from the gun.

What could be heard, though, was the sonic crack of the bullet as it passed the telegraph poles on the side of the road Maxim fired down.

Maxim's early designs are proof positive that the amount of gas the cartridge develops is immaterial as long as the silencer is designed to accommodate it.

Interestingly enough, the other thing that Maxim designed?

The first successful mufflers for internal combustion engines.
 
Mike, this is what my Lee load manual lists as fastest standard pressure loads:

.38 Special, 110 gr. - 1216 fps
9mm, 115 gr. - 1322 fps
.357 Magnum, 110 gr. - 2040 fps
 
Mike,

The hottest factory standard pressure Winchester .38 Special 158 gr load is 755 FPS. S&B's is 997 FPS.

With a 242 FPS of difference, factory loads are meaningless.

The heaviest 150 gr. 9mm standard pressure factory load I can find goes 1000 fps.

If you want to compare factory loads, 9mm and .38 are equal. S&Bs .357 Magnum load goes 1328 FPS at 158 gr. How is that more similar than .38 Special?

Are you just basing this on anemic factory loads designed for 50 year old Model 19s and pre-war .38s?
 
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