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Joined: Feb 2010
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Campfire Ranger
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Campfire Ranger
Joined: Feb 2010
Posts: 17,927 |
So after filling my belly this afternoon I was thumbing through my father-in-laws copy. It may have been my imagination or the post meal coma, but when he is talking about calibers and metric equivalents, I believe all the numbers are off. Is it me or did it read 6.5mm = .256?
....and I've got to admit, I'm asking Santa for a copy. Something about early hunting books has grabbed my attention and I can't quite put my finger on the reason why.
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Joined: May 2005
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Campfire Tracker
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Campfire Tracker
Joined: May 2005
Posts: 6,551 |
Sounds about right for lands. Grooves at .264. Caliber has been measured both ways. .300 Savage and .308 Win. use the same bullet.
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Joined: Feb 2010
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Campfire Ranger
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Campfire Ranger
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Interesting, never thought of it that way.
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Joined: Jul 2001
Posts: 60,206 Likes: 26
Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,206 Likes: 26 |
A millimeter equals .03937" (or very close to it). Multiply 6.5 x .03937 and the result is .255905, which rounds off to .256". Do the same math and you'll find 7mm is just about .276", which means the .270 Winchester shoots a bullet much closer to 7mm in diameter than any of the so-called 7mm rounds.
The old option of naming cartridges by either their bore or groove diameter isn't limited to non-metric rounds.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Joined: Jun 2003
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Campfire Member
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Campfire Member
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I haven't read the book in years, but my guess would be a typo referencing the .256 Newton, which I believe would have been a 6.5 or very close. That was part of the old nomenclature from the 19th century, where they also called the 7x57 the .275 Rigby.
forepaw
"Only accurate rifles (that are light enough to be carried by a middle-aged man in rough country) are interesting"
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Joined: Jul 2001
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Campfire Kahuna
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Campfire Kahuna
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“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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Joined: Jun 2003
Posts: 302
Campfire Member
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Campfire Member
Joined: Jun 2003
Posts: 302 |
Yep, just checked my old copy and it is all there, with good clear explanations.
forepaw
"Only accurate rifles (that are light enough to be carried by a middle-aged man in rough country) are interesting"
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