.378” minus .375” = .003”...or better known as a human hair

Just to add fuel to the fire...

340 Weatherby
330 Dakota

Both .338
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Or the following:

22-250
220 Swift
222 Remington
223 Remington
224 TTH
224 Valkyrie
5.56 NATO

All the same bullet diameter.
 
In the .22 field, I like to point out that advertising has given us the .218 Bee, .219 Zipper, .220 Swift, .221 Fireball, .222 Remington, .223 Remington, .224 Weatherby, and .225 Winchester, all shooting .224" diameter bullets.
But the .22 Jet, .22 Hornet (early), and .22 Savage don't.
 
But the .22 Jet, .22 Hornet (early), and .22 Savage don't.
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On that note...
Along with the .22 Savage (aka .22 Hi Power, aka 5.6×52mmR), you've got the .230 Ackley.
It's .220 Swift AI loaded with a .228" bullet, in order to skirt caliber restrictions for big game hunting in Utah and Wyoming. (Whether or not a .224" or .228" groove diameter was used could be debatable. I don't recall if Ackley specified, but he was definitely not opposed to firing slightly over-sized bullets through smaller groove diameters.)
 
You're correct. I remembered incorrectly.
It wasn't based on the .220 Swift, either (I think I got that from tales told by my father at the reloading bench). It was a shortened .30-06.
I checked Ackley's Handbook (Vol 1), and it does specify ".23 caliber" multiple times, with special-order bullets listed as available from Fred Barnes or Sisk. I couldn't find a better reference to groove diameter, though. It may have been .230", or the slightly more logical .236" (already established, to some degree).
 
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